Harryxun/sft_time huggingface dataset:
### BUGGY CODE ###

# -*- coding: utf-8 -*-
 
## Library
 
import sys
from fractions import gcd
import math
from math import ceil,floor
import collections
from collections import Counter
import itertools
import copy

## input
 
# N=int(input())
# A,B,C,D=map(int, input().split())
# S = input()
# yoko = list(map(int, input().split()))
# tate = [int(input()) for _ in range(N)]
# N, M = map(int,input().split()) 
#    P = [list(map(int,input().split())) for i in range(M)]
#    S = []
#    for _ in range(N):
#        S.append(list(input()))

N=int(input())
A = list(map(int, input().split()))

B = []

for i in range(N):
    if i%2 == 0:
        B.append(A[i])
    else:
        B.insert(0,A[i])

if N%2 == 1:
    B.reverse()

print(B[0],end="")
for i in range(1,N):
    print("",B[i],end="")

### FIXED CODE ###

# -*- coding: utf-8 -*-
 
## Library
 
import sys
from fractions import gcd
import math
from math import ceil,floor
import collections
from collections import Counter
import itertools
import copy

## input
 
# N=int(input())
# A,B,C,D=map(int, input().split())
# S = input()
# yoko = list(map(int, input().split()))
# tate = [int(input()) for _ in range(N)]
# N, M = map(int,input().split()) 
#    P = [list(map(int,input().split())) for i in range(M)]
#    S = []
#    for _ in range(N):
#        S.append(list(input()))

N=int(input())
A = list(map(int, input().split()))

B=[0]*N

for i in range(N):
  if i<(N+1)//2:
    B[i]=A[N-1-2*i]
  else:
    B[i]=A[N-2*(N-i)]

print(*B)
### BUGGY CODE ###

def kitaiti(a):
    prob=1/a
    b=0
    for i in range(1,a+1):
        b+=i
    kitaiti=prob*b
    return kitaiti

N,K=map(int,input().split())
p=list(map(int,input().split()))

e=0
anse=0
for i in range(N-K+1):
    e=0
    for j in range(i,i+K):
        e+=kitaiti(p[j])
    if anse<e:
        anse=e
    else:
        pass

print(anse)

### FIXED CODE ###

N,K=map(int,input().split())
p=list(map(int,input().split()))
pE=list(map(lambda i :(1+i)/2,p))
pA=[sum(pE[0:K])]
inter=sum(pE[0:K])
for i in range(0,N-K):
    inter=inter+pE[K+i]-pE[i]
    pA.append(inter)

ans=max(pA)
print(ans)
### BUGGY CODE ###

a=input()
num=len(a)
mod_map={0:1}
moji_int=0
Sn=[0]*(num+1)
tens=[1]*(num+1)
for i in range(-1,-num-1,-1):
    tens[-i]=tens[-i-1]*10
    tmp=int(a[i])*(tens[-i-1]%2019)
    Sn[-i]=(Sn[-i-1]+tmp%2019)%2019
    mod=Sn[-i]
    if mod not in mod_map:
        mod_map[mod]=1
    else:
        mod_map[mod]+=1

res=0
for i in mod_map.values():
    res+=int(i*(i-1)/2)
print(res)


### FIXED CODE ###

a=reversed(input())
#num=len(a)
mod_list=[1]+[0]*2019
moji_int=0
Sn=0
tens=1
for i in a:
    tmp=int(i)*(tens)
    Sn=(Sn+tmp)%2019
    mod=Sn
    tens=tens*10%2019
    mod_list[mod]+=1
res=0
for i in mod_list:
    res+=int(i*(i-1)/2)
print(res)
### BUGGY CODE ###

N=int(input())
M=len(input())
O=10**9+7
D=[pow(-~O//2,M,O)]+[0]*N
for _ in'_'*N:D=[D[0]+D[1]]+[(i+2*j)%O for i,j in zip(D[2:]+[0],D[:-1])]
print(D[M])

### FIXED CODE ###

N=int(input())
M=len(input())
O=10**9+7
D=[pow(-~O//2,M,O)]+[0]*-~N
for _ in'_'*N:D=[((2*D[i-1]if i else D[0])+D[i+1])%O for i in range(N+1)]+[0]
print(D[M])
### BUGGY CODE ###

def main():
    from sys import stdin
    input = stdin.readline

    n, m, s, t = map(int, input().split())
    uvab = [list(map(int, input().split())) for _ in [0]*m]
    g_yen = [[] for _ in [0]*n]
    [g_yen[u-1].append([v-1, a]) for u, v, a, b in uvab]
    [g_yen[v-1].append([u-1, a]) for u, v, a, b in uvab]

    g_snk = [[] for _ in [0]*n]
    [g_snk[u-1].append([v-1, b]) for u, v, a, b in uvab]
    [g_snk[v-1].append([u-1, b]) for u, v, a, b in uvab]

    import heapq

    def dijkstra(g, start):
        inf = 10**15
        dist = [inf for _ in [0]*n]
        h = [(0, start)]
        heapq.heapify(h)
        while h:
            d, i = heapq.heappop(h)
            if dist[i] == inf:
                dist[i] = d
                for x, y in g[i]:
                    heapq.heappush(h, (d+y, x))
        return dist

    yen = dijkstra(g_yen, s-1)
    snk = dijkstra(g_snk, t-1)

    cost = [yen[i]+snk[i] for i in range(n)]
    m = cost[-1]
    for i in range(n-1, -1, -1):
        m = min(m, cost[i])
        cost[i] = m

    for i in cost:
        print(10**15-i)


main()


### FIXED CODE ###

n,m,s,t=map(int,input().split())
uvab=[list(map(int,input().split())) for _ in [0]*m]
g_yen=[[] for _ in [0]*n]
[g_yen[u-1].append([v-1,a]) for u,v,a,b in uvab]
[g_yen[v-1].append([u-1,a]) for u,v,a,b in uvab]

g_snk=[[] for _ in [0]*n]
[g_snk[u-1].append([v-1,b]) for u,v,a,b in uvab]
[g_snk[v-1].append([u-1,b]) for u,v,a,b in uvab]

import heapq
def dijkstra(g,start):
    inf=10**15
    dist=[inf for _ in [0]*n]
    h=[(0,start)]
    heapq.heapify(h)
    while h:
        d,i=heapq.heappop(h)
        if dist[i]==inf:
            dist[i]=d
            for x,y in g[i]:
                heapq.heappush(h,(d+y,x))
    return dist

yen=dijkstra(g_yen,s-1)
snk=dijkstra(g_snk,t-1)

cost=[yen[i]+snk[i] for i in range(n)]
m=cost[-1]
for i in range(n-1,-1,-1):
    m=min(m,cost[i])
    cost[i]=m
    
for i in cost:
    print(10**15-i)
### BUGGY CODE ###

from scipy.sparse import*
i=lambda:tuple(map(int,input().split()))
f=csgraph.floyd_warshall
n,m,l=i()
d=eval('[0]*-~n,'*-~n)
exec('a,b,c=i();d[a][b]=c;'*m)
d=f(f(d,0)<=l)
d[d>n]=0
exec('print(int(d[i()])-1);'*i()[0])

### FIXED CODE ###

from scipy.sparse import*
s=csgraph.floyd_warshall
n,m,l,*t=map(int,open(0).read().split())
d=eval('[9e9]*-~n,'*-~n)
for a,b,c in zip(*[iter(t[:m*3])]*3):d[a][b]=d[b][a]=c
d=s(d)
d[d>l]=9e9
d[d<=l]=1
d=s(d)
d[d>9e9]=9e9
for s,t in zip(*[iter(t[m*3+1:])]*2):print(int(d[s,t]%9e9-1))
### BUGGY CODE ###

def main():
  (n,q),c,*z=[[*map(int,t.split())]for t in open(0)]
  a=[0]*q
  j,*b=t=[0]*9**6
  for i in sorted(range(q),key=lambda x:z[x][1]):
    l,r=z[i]
    while j<r:
      d=c[j]
      j+=1
      x,y,b[d]=b[d]+1,j+1,j
      while x<=n:t[x]+=1;x+=x&-x
      while y<=n:t[y]-=1;y+=y&-y
    while l:a[i]+=t[l];l-=l&-l
  print(' '.join(map(str,a)))
main()

### FIXED CODE ###

import sys
from operator import itemgetter
buf = sys.stdin.buffer
input = buf.readline
class BIT:
    def __init__(self, n):
        self.n = n
        self.tree = [0] * (n + 1)
    def add(self, i, x):
        n, tree = self.n, self.tree
        while i <= n:
            tree[i] += x
            i += i & -i
    def sum(self, i):
        tree = self.tree
        s = 0
        while i:
            s += tree[i]
            i -= i & -i
        return s
def main():
    n, q = map(int, input().split())
    res = [0] * q
    *c, = map(int, input().split())
    q = [(i, l, r) for i, (l, r) in enumerate(zip(*[map(int, buf.read().split())] * 2))]
    q.sort(key=itemgetter(2))
    bit = BIT(n + 2)
    add, sum = bit.add, bit.sum
    b = [1] * (n + 1)
    j = 1
    for i, l, r in q:
        while j <= r:
            d = c[j - 1]
            j += 1
            k = b[d]
            b[d] = j
            add(k + 1, 1)
            add(j + 1, -1)
        res[i] = sum(l + 1)
    print(' '.join(map(str, res)))
main()
### BUGGY CODE ###

S = input()
Q = int(input())
Que = [input().split(" ") for i in range(Q)]

for i in Que:
    T = int(i[0])
    if T == 1:
        S = S[::-1]
    else:
        F = int(i[1])
        C = i[2]
        if F == 1:
            S = C + S
        else:
            S = S + C
print(S)

### FIXED CODE ###

import sys
from collections import deque

S = deque(sys.stdin.readline().rstrip())
Q = int(sys.stdin.readline().rstrip())
flip = False

for i in range(Q):
    Que = sys.stdin.readline().rstrip()
    if Que == "1":
        flip = not(flip)
    else:
        Query = Que.split()
        F = Query[1]
        if (F == "1") ^ flip:
            S.appendleft(Query[2])
        else:
            S.append(Query[2])
print("".join(S) if not flip else "".join(S)[::-1])
### BUGGY CODE ###

N=int(input())
X=[int(i) for i in input().split()]
for i in range(N):
  x=X.copy()
  del x[i]
  x.sort()
  print(x[N//2-1])
  

### FIXED CODE ###

N=int(input())
X=[int(i) for i in input().split()]
x=X.copy()
x.sort()
mina=x[N//2-1]
minb=x[N//2]
for i in range(N):
  if mina<X[i]:
    print(mina)
  else :
    print(minb)
### BUGGY CODE ###

import scipy as sp

total_cost = 0

N, M = (map(int, input().split()))

AB_list = sp.array([0,0])
for i in range(N):
    AB_list = sp.vstack([AB_list, sp.array(list(map(int, input().split())))])


AB = AB_list[AB_list[:,0].argsort(), :]

A_list = AB[:,0]
B_list = AB[:,1]
for i in range(N+1):
    if B_list[i]<M:
        M = M - B_list[i]
        total_cost =  total_cost + A_list[i] * B_list[i]
       # print(i,M)
    else:
        total_cost = total_cost + M * A_list[i]
        break
print(total_cost)


### FIXED CODE ###

total_cost = 0

N, M = (map(int, input().split()))

AB_list = []
for i in range(N):
    AB_list.append((list(map(int, input().split()))))

AB_list = sorted(AB_list)

for i in range(N):
    if AB_list[i][1]<M:
        M = M - AB_list[i][1]
        total_cost =  total_cost + AB_list[i][0]*AB_list[i][1]
    else:
        total_cost = total_cost + M * AB_list[i][0]
        break
print(total_cost)
### BUGGY CODE ###

N, M = map(int, input().split())
p = [0] * M
S = [''] * M
for i in range(M):
    p_i, S[i] = input().split()
    p[i] = int(p_i)

penal_ct = 0
ac_count = 0
# prev_ac_num = -1

ac_list = [False] * N

for i in range(M):
    if S[i] == 'AC' and (not ac_list[p[i] - 1]): # ACかつ今までにACしてない
        ac_list[p[i] - 1] = True
        ac_count += 1
        if i == 0:
            continue
        for j in range(i)[::-1]:
            if p[j] == p[i] and S[j] == 'WA':
                penal_ct += 1



# for i in range(1, M)[::-1]:
#     if S[i] == 'AC' and p[i] != prev_ac_num:
#         prob_num = prev_ac_num = p[i]
#         ac_count += 1
#         for j in range(i)[::-1]:
#             if p[j] == prob_num and S[j] == 'WA':
#                 penal_ct += 1
print(ac_count, penal_ct) 


### FIXED CODE ###

N, M = map(int, input().split())
p = [0] * M
S = [''] * M
for i in range(M):
    p_i, S[i] = input().split()
    p[i] = int(p_i)




penal_ct = 0
ac_count = 0
# prev_ac_num = -1
ac_list = [False] * N
pos = 0

wa_count = [0] * N

for i in range(M):
    if S[i] == 'WA':
        wa_count[p[i] - 1] += 1
        # print(wa_count[p[i] - 1])
    elif (not ac_list[p[i] - 1]) and S[i] == 'AC': # ACかつ今までにACしてない
        ac_list[p[i] - 1] = True
        ac_count += 1
        if i == 0:
            continue
        penal_ct += wa_count[p[i] - 1]
        # for j in range(i)[::-1]:
        #     if S[j] == 'WA' and p[j] == p[i]:
        #         penal_ct += 1
    # if all(ac_list):
        # break
# print(wa_count)
print(ac_count, penal_ct)
### BUGGY CODE ###

n = int(input())
ab = sorted([list(map(int, input().split())) for _ in range(n)])

res = 0
for i in range(n):
    a = max(ab, key=lambda x:x[0])
    b = max(ab, key=lambda x:x[1])
    if max(a) > max(b):
        ind = ab.index(a)
    else:
        ind = ab.index(b)
    abi = ab.pop(ind)
    if i % 2 == 0:
        res += abi[0]
    else:
        res -= abi[1]

print(res)

### FIXED CODE ###

n = int(input())
dd = []
sb = 0
for _ in range(n):
    a, b = map(int, input().split())
    dd.append(a+b)
    sb -= b

abd = sorted(dd, reverse=True)

res = 0
for i in range(n):
    d = abd.pop(0)
    if i % 2 == 0:
        res += d

print(res+sb)
### BUGGY CODE ###

S = input()
T = input()

dp = [[[] for _ in range(len(S)+1)] for _ in range(len(T)+1)]
cdp = [[None for _ in range(len(S)+1)] for _ in range(len(T)+1)]
dp[0] = [[''] for _ in range(len(T)+1)]
cdp[0] = [0 for _ in range(len(T)+1)]

for i in range(1,len(T)+1):
    for j in range(len(S)+1):
        if j == 0:
            dp[i][j] = ['']
            cdp[i][j] = 0
            continue
        if S[j-1] == T[i-1]:
            dp[i][j] = [p + S[j-1] for p in dp[i-1][j-1]]
            cdp[i][j] = cdp[i-1][j-1] + 1
        else:
            if cdp[i][j-1] > cdp[i-1][j]:
                dp[i][j] = dp[i][j-1]
                cdp[i][j] = cdp[i][j-1]
            else:
                dp[i][j] = dp[i-1][j]
                cdp[i][j] = cdp[i-1][j]

print(dp[-1][-1][0])


### FIXED CODE ###

S = input()
T = input()

# dp = [[[] for _ in range(len(S)+1)] for _ in range(len(T)+1)]
cdp = [[None for _ in range(len(S)+1)] for _ in range(len(T)+1)]
ddp = [[None for _ in range(len(S)+1)] for _ in range(len(T)+1)]
# dp[0] = [[''] for _ in range(len(S)+1)]
cdp[0] = [0 for _ in range(len(S)+1)]
ddp[0] = [0 for _ in range(len(S)+1)]

for i in range(1,len(T)+1):
    for j in range(len(S)+1):
        if j == 0:
            # dp[i][j] = ['']
            cdp[i][j] = 0
            ddp[i][j] = 0
            continue
        if S[j-1] == T[i-1]:
            # dp[i][j] = [p + S[j-1] for p in dp[i-1][j-1]]
            cdp[i][j] = cdp[i-1][j-1] + 1
            ddp[i][j] = 2
        else:
            if cdp[i][j-1] > cdp[i-1][j]:
                # dp[i][j] = dp[i][j-1]
                cdp[i][j] = cdp[i][j-1]
                ddp[i][j] = 1
            else:
                # dp[i][j] = dp[i-1][j]
                cdp[i][j] = cdp[i-1][j]
                ddp[i][j] = 0

# print(dp[-1][-1][0])

i, j = len(T), len(S)
L = ''
while i > 0 and j > 0:
    if ddp[i][j] == 2:
        i -= 1
        j -= 1
        L += T[i]
    elif ddp[i][j] == 1:
        j -= 1
    elif ddp[i][j] == 0:
        i -= 1

print(L[::-1])
### BUGGY CODE ###

def main():
    s = input()
    k = int(input())
    ss = []
    for i in range(len(s)):
        for j in range(i+1, len(s)+1):
            ss.append(s[i:j])
    print(sorted(set(ss))[k-1])

if __name__ == "__main__":
    main()

### FIXED CODE ###

s = input()
k = int(input())
n = len(s)
if n == 1:
    print(s)
elif n == 2:
    l2 = sorted(list(set([s[i:i+2] for i in range(n-1)])))
    print(l2[0])
elif n == 3:
    l1 = list(set(s))
    l2 = list(set([s[i:i+2] for i in range(n-1)]))
    l3 = list(set([s[i:i+3] for i in range(n-2)]))
    out = sorted(l1 + l2 + l3)
    print(out[k-1])
elif n == 4:
    l1 = list(set(s))
    l2 = list(set([s[i:i+2] for i in range(n-1)]))
    l3 = list(set([s[i:i+3] for i in range(n-2)]))
    l4 = list(set([s[i:i+4] for i in range(n-3)]))
    out = sorted(l1 + l2 + l3 + l4)
    print(out[k-1])
else:
    l1 = list(set(s))
    l2 = list(set([s[i:i+2] for i in range(n-1)]))
    l3 = list(set([s[i:i+3] for i in range(n-2)]))
    l4 = list(set([s[i:i+4] for i in range(n-3)]))
    l5 = list(set([s[i:i+5] for i in range(n-4)]))
    out = sorted(l1 + l2 + l3 + l4 + l5)
    print(out[k-1])
### BUGGY CODE ###

import numpy as np
N = int(input())
A = []
for n in range(N):
    A.append(int(input()))
A = np.array(A)
for n in range(N):
    ind_rm = [n]
    ind = np.ones(N, dtype=bool)
    ind[ind_rm] = False
    A_tmp = [a for a in A if a not in ind_rm]
    print(max(A[ind]))

### FIXED CODE ###

import numpy as np
N = int(input())
A = []
for n in range(N):
    A.append(int(input()))
A = np.array(A)
all_max = np.max(A)
max_ind = np.argmax(A)
max_remove = np.ones(N, dtype=bool)
max_remove[max_ind] = False
second_max = np.max(A[max_remove])
# print(all_max)
# print(second_max)
for n in range(N):
    if n == max_ind:
        print(second_max)
    else:
        print(all_max)
### BUGGY CODE ###

while 1:
	try:
		s,t = raw_input(),raw_input()
		if len(s) < len(t): s,t = t,s
		ans = 0
		for sp in range(len(t)):
			for L in range(len(t)-sp):
				if t[sp:sp+L] in s:
					ans = max(ans,L)
				else:
					break
		print ans
	except:
		break

### FIXED CODE ###

while 1:
	try:
		s,t = raw_input(),raw_input()
		if len(s) < len(t): s,t = t,s
		MAXL = sum(min(s.count(i),t.count(i)) for i in set(list(s))&set(list(t)))
		ans = 0
		for sp in range(len(t)):
			if len(t) - sp <= ans:
				break
			for L in range(ans+1,min(MAXL+1,len(t)-sp+1)):
				if t[sp:sp+L] in s:
					ans = L
				else:
					break
		print ans
	except:
		break
### BUGGY CODE ###

from itertools import permutations
n,m,r = map(int,input().split())
route = list(map(int,input().split()))

dp = [[0 for _ in range(n)] for _ in range(n)]
INF = 10**18
for i in range(n):
    for j in range(n):
        if i!=j:
            dp[i][j] = INF
for _ in range(m):
    a,b,c = map(int,input().split())
    dp[a-1][b-1] = c
    dp[b-1][a-1] = c
#print(dp)

#最短リスト
for chu in range(n):
    for fir in range(n):
        for la in range(n):
            dp[fir][la] = min(dp[fir][la] , dp[fir][chu] +  dp[chu][la])

ans = 10**10
for j in permutations(route, r):
    a = 0
    for q,w in zip(j[:-1], j[1:]):
        a += dp[q-1][w-1]
        
    ans = min(ans,a)
print(ans)

### FIXED CODE ###

from itertools import permutations
n,m,r = map(int,input().split())
route = list(map(int,input().split()))

dp = [[0 for _ in range(n)] for _ in range(n)]
INF = 10**18
for i in range(n):
    for j in range(n):
        if i!=j:
            dp[i][j] = INF
for _ in range(m):
    a,b,c = map(int,input().split())
    dp[a-1][b-1] = c
    dp[b-1][a-1] = c
#print(dp)

#最短リスト
for chu in range(n):
    for fir in range(n):
        for la in range(n):
            dp[fir][la] = min(dp[fir][la] , dp[fir][chu] +  dp[chu][la])

ans = 10**10
for j in permutations(route, r):
    a = 0
    for q,w in zip(j[:-1], j[1:]):
        a += dp[q-1][w-1]
        
    ans = min(ans,a)
print(ans)
### BUGGY CODE ###

#atcoder_RedAndBlueBalls

import numpy as np 

MAX = pow(10,9)+7

def C(n,m):
    arr = np.zeros((n+1,m+1),int)
    arr[0][0] = 1 
    i = 1 
    while(i < n+1):
        arr[i][0] = 1 
        j = 1 
        while(j< m+1):
            arr[i][j] = (arr[i-1][j] + arr[i-1][j-1]) % MAX 
            j+=1 
        i+=1 
    return(arr)  

n,k = input().split()
n,k = int(n),int(k) 

arr = C(max(n-k+1,k-1),k) 

for i in range(k):
    ans = ( arr[n-k+1][i+1] * arr[k-1][i] ) % MAX 
    print(ans) 



### FIXED CODE ###

#atcoder_RedAndBlueBalls

import numpy as np 

MAX = pow(10,9)+7

def fact(n):
    ls = [1] 
    for i in range(1,n+1):
        ls.append(ls[i-1]*i) 
    return(ls) 

n,k = input().split()
n,k = int(n),int(k) 

ls = fact(2000)

def C(n,m):
    return ((ls[n]//(ls[m]*ls[n-m])) % MAX)

for i in range(k):
    ans = ( C(n-k+1,i+1) * C(k-1,i) ) % MAX 
    print (ans)
### BUGGY CODE ###

import sys
import itertools
sys.setrecursionlimit(1000000000)
from heapq import heapify,heappop,heappush,heappushpop
import math
import collections
import copy

def make_divisors(n):
    divisors = []
    for i in range(1,int(n**0.5)+1):
        if n%i == 0:
            divisors.append(i)
            if i != n//i:
                divisors.append(n//i)
    divisors.sort()
    return divisors


if __name__ == "__main__":
    n = int(input())
    a = sorted(list(map(int,input().split())))
    cnt = 0
    pattarn = []
    for i in range(n):
        b = make_divisors(a[i])
        pattarn.append(set(b))
    queue = collections.deque(a)
    for i in range(n):
        flag = 0
        p = queue.popleft()
        for j in queue:
            if j in pattarn[i]:
                flag = 1
        if flag == 0:
            cnt+=1
        queue.append(p)
    print(cnt)

### FIXED CODE ###

import sys
import itertools
sys.setrecursionlimit(1000000000)
from heapq import heapify,heappop,heappush,heappushpop
import math
import collections
import copy

if __name__ == "__main__":
    n = int(input())
    a = sorted(list(map(int,input().split())))
    M = 1000005
    dp = [0]*(M)
    for i in range(n):
        if dp[a[i]] != 0:
            dp[a[i]] = 2
            continue
        for j in range(a[i],M,a[i]):
            dp[j]+=1
    cnt = 0
    for i in range(n):
        if dp[a[i]] == 1:
            cnt+=1
    print(cnt)
### BUGGY CODE ###

from bisect import bisect_left
import sys
sdin = sys.stdin.readline

# 入力
n = int(sdin())
a = list(map(int, sdin().split()))
b = list(map(int, sdin().split()))

ans = 0

# k-th bitについて
for k in range(29):
    base = 2**k
    a_k = [ai % 2**(k+1) for ai in a]
    b_k = [bj % 2**(k+1) for bj in b]
    b_k.sort()
    
    one = 0
    for ai in a_k:
        first = bisect_left(b_k, 2*base - ai) - bisect_left(b_k, 1*base - ai)
        second =  bisect_left(b_k, 4*base - ai) - bisect_left(b_k, 3*base - ai)
        
        one += (first + second)
        
    if one % 2 == 1:
        ans += 2**k
        
print(ans)

### FIXED CODE ###

import sys
sdin = sys.stdin.readline


# 入力
n = int(sdin())
a = list(map(int, sdin().split()))
b = list(map(int, sdin().split()))

ans = 0

# バケットソートする
for k in range(29):
    a_nex = [[],[]]
    b_nex = [[],[]]
    for ai in a:
        a_nex[(ai & (1<<k)) >> k].append(ai)
            
    for bj in b:
        b_nex[(bj & (1<<k)) >> k].append(bj)
    

    a = []
    b = []
    for i in range(2):
        a = a + a_nex[i]
        b = b + b_nex[i]
        
    mask = pow(2,k+1) - 1
    a_mask = [ai & mask for ai in a]
    b_mask = [bj & mask for bj in b]
    
    base = pow(2,k)
    itr = [n]*4
    count = 0
    for ai in a_mask:
        border = [
                base - ai,
                2*base - ai,
                3*base - ai,
                4*base - ai
        ]
        
        for i in range(4):
            while 0 < itr[i] and border[i] <= b_mask[itr[i] - 1]:
                itr[i] -= 1
            
            
        count += ((itr[1] - itr[0]) + (itr[3]) - itr[2])
    
    if count & 1:
        ans += base
    
    
print(ans)
### BUGGY CODE ###

# coding: utf-8
# Your code here!
kai = int(input())
a = 0
b = 0
cou = 0
kaz = []

for i in range(kai):
    a,b = map(int,input().split(" "))
    kaz.append(a)
    kaz.append(b)

for j in range(kai):
    while True:
        if (kaz[(kai-j)*2 -2]+cou) % kaz [(kai-j)*2 -1] == 0:
            break
        else:
            cou += 1
print(cou)

### FIXED CODE ###

n = int(input())
p = []
for i in range(n):
    a , b = map(int,input().split())
    p.append([a,b])
ans = 0
for i in reversed(range(n)):
    if (p[i][0] + ans) % p[i][1] != 0:
        ans += p[i][1] - ((p[i][0] + ans)%p[i][1])
print(ans)
### BUGGY CODE ###

n,k = map(int, input().split())
A = list(map(int, input().split()))
now = 1
f = 0
past = [0]*n
if n>k:
	for i in range(k):
		now = A[now-1]
	print(now)
	exit()
c = 0
for i in range(n):
	past[c] = now
	now = A[now-1]
	c+=1
	if now in past:
		f = 1
		break


loop_end = c
loop_start = past.index(now)
#print(past, now, loop_end, loop_start)
res = (k-loop_start)%(loop_end-loop_start)
now = past[loop_start]
for i in range(res):
	now = A[now-1]
print(now)

### FIXED CODE ###

n,k = map(int, input().split())
b = list(map(int, input().split()))
a=0
for i in range(n):
    b[i] -= 1
if k<n:
    for i in range(k):
        a = b[a]
    print(a+1)
    exit()
c = [-1]*n
cc = 0
se = set()
while a not in se:
    c[a] = cc
    cc += 1
    se.add(a)
    a = b[a]
for i in range((k-c[a])%(cc-c[a])):
    a = b[a]
print(a+1)
### BUGGY CODE ###

from fractions import gcd
from functools import reduce

def gcd_list(x):
    return reduce(gcd, x)

n = int(input())
a = list(map(int, input().split()))
y = []
for i in range(n):
    if i == 0:
        x = a[1:]
    elif i == n - 1:
        x = a[:-1]
    else:
        x = a[:i] + a[i + 1:]
    y.append(gcd_list(x))
print(max(y))


### FIXED CODE ###

def divisor(x):
    y = list()
    for i in range(1, int(x ** 0.5 + 1)):
        if x % i == 0:
            y.append(i)
            y.append(x // i)
    return y

n = int(input())
a = list(map(int, input().split()))
a.sort()
d0 = divisor(a[0])
d1 = divisor(a[1])
d = dict.fromkeys(d0 + d1)
ans = 1
for di in sorted(list(d.keys()))[::-1]:
    flag = False
    ans_flag = True
    for ai in a:
        if ai % di != 0:
            if flag:
                ans_flag = False
                break
            else:
                flag = True
    if ans_flag:
        ans = di
        break
print(ans)
### BUGGY CODE ###

from collections import deque
N,M = map(int,input().split())
ab= [list(map(int,input().split())) for i in range(M)]

d = deque()

for i in range(len(ab)):
    if ab[i][1] == N:
        d.append(ab[i][0])

for i in range(len(d)):
    for j in range(len(ab)):
        if ab[j][0] == 1 and ab[j][1] == d[i]:
            print('POSSIBLE')
            exit()

print('IMPOSSIBLE')

### FIXED CODE ###

N,M = map(int,input().split())

s = []
g = []
for i in range(M):
    a,b = map(int,input().split())
    if a == 1:
        s.append(b)
    elif b == N:
        g.append(a)
    
ans = set(s) & set(g)

if len(ans) >= 1:
    print('POSSIBLE')
else:
    print('IMPOSSIBLE')