Harryxun/stf_run huggingface dataset:
def main():
 	import sys
    input = sys.stdin.buffer.readline
    N = int(input())
    A = [list(map(int, input().split())) for i in range(N)]

    id = [0]*N
    Lock = [-1]*N
    ans = 0
    flag = [True]*N
    min_id = 0
    while(min_id < N-1):
        ans += 1
        if ans > (N*(N-1)) // 2:
            break
        tmp = set()
        for i in range(N):
            if id[i] >= N-1:
                continue
            else:
                if Lock[i] >= 0:
                    continue
                else:
                    if Lock[A[i][id[i]]-1] == i and i not in tmp:
                        Lock[A[i][id[i]]-1] = -1
                        id[A[i][id[i]]-1] += 1
                        tmp.add(A[i][id[i]]-1)
                        id[i] += 1
                    else:
                        if i not in tmp:
                            Lock[i] = A[i][id[i]]-1
        min_id = min(id)
    if ans > (N*(N-1)) // 2:
        print(-1)
    else:
        print(ans)
main()

### FIXED CODE ###

def main():
    import sys
    import time
    input = sys.stdin.buffer.readline
    start = time.time()
    N = int(input())
    A = [tuple(map(int, input().split())) for i in range(N)]

    id = [0]*N
    Lock = [-1]*N
    ans = 0
    min_id = 0
    M = (N*(N-1)) // 2

    while(min_id < N-1):
        now = time.time()
        if now - start > 1.9:
            ans = M
            break
        ans += 1
        if ans > M:
            break
        tmp = set()
        for i in range(N):
            if id[i] >= N-1:
                continue
            else:
                if Lock[i] >= 0:
                    continue
                else:
                    a = A[i][id[i]]
                    if Lock[a-1] == i and i not in tmp:
                        Lock[a-1] = -1
                        id[a-1] += 1
                        tmp.add(a-1)
                        id[i] += 1
                    else:
                        if i not in tmp:
                            Lock[i] = A[i][id[i]]-1
        min_id = min(id)
    if ans > M:
        print(-1)
    else:
        print(ans)


main()
S = input()
RS = reversed(S)

count=0

for i in range(len(S) // 2):
    if S[i] != RS[i]:
        count += 1

print(count)
        


### FIXED CODE ###

S = input()


count=0

for i in range(len(S) // 2):
    if S[i] != S[-1-i]:
        count += 1

print(count)
n, k = map(int, input().split(' '))
a = list(map(int, input().split(' ')))

Min = 0
Max = 0

comb_min = 1
comb_max = 1

a_sort = sorted(a)

def SUM(a):
    count = 0
    comb = 1
    for i, num in enumerate(a_sort):
        if i == k-1:
            count += num
        elif i >= k-1:
            comb = comb * i / (i-k+1)
            count += comb * num
            count = count % (10e08+7)
    return count

Min = SUM(a_sort)
Max = SUM(a_sort.reverse())

print(int( (Min - Max + (10e08+7)) % (10e08+7)))

### FIXED CODE ###

import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**6)
 
class Combination():
    # コンストラクタ
    def __init__(self, N:int, P:int):
        self.N = N
        self.P = P
 
        # fact[i] = (i! mod P)
        self.fact = [1, 1]   
        # factinv[i] = ((i!)^(-1) mod P)
        self.factinv = [1, 1]
        # factinv 計算用
        self.inv = [0, 1]    
 
        for i in range(2, N+1):
            self.fact.append((self.fact[-1] * i) % P)
            self.inv.append((-self.inv[P % i] * (P // i)) % P)
            self.factinv.append((self.factinv[-1] * self.inv[-1]) % P)
    
    # nCk (mod P)   (ただし、n<=N)
    def getComb(self, n:int, k:int):
        if (k < 0) or (n < k):
            return 0
        k = min(k, n - k)
        return self.fact[n] * self.factinv[k] * self.factinv[n-k] % self.P
 
def main():
    N,K = map(int,input().split())
    A = sorted([int(i) for i in input().split()])
 
    mod = 10**9+7
 
    COMB = Combination(N,mod)
 
    cmb = [0] * (N-K+1)
    for i in range(N-K+1):
        cmb[i] = COMB.getComb(i+(K-1),K-1)
 
    sum_max = 0
    for i in range(K-1,N):
        sum_max = (sum_max + cmb[i-(K-1)] * A[i]) % mod
 
    sum_min = 0
    for i in range(N-K,-1,-1):
        sum_min = (sum_min + cmb[(N-K)-i] * A[i]) % mod
 
    answer = sum_max - sum_min
    print(answer % mod)
 
if __name__ == "__main__":
    main()
n,a,b=map(int, input().split())

al = [1]*a
bl = [0]*b
cl =[]

for i in range(20):
    cl = cl + al + bl

print(sum(cl[:n]))

### FIXED CODE ###

n,a,b=map(int, input().split())

d = a+b
c = n%d
e = n//d

if c <= a:
    print(e*a+c)
if c > a:
    print((e+1)*a)
n,a,b-map(int,input().split())
print(min(a*n,b))

### FIXED CODE ###

n,a,b=map(int,input().split())
print(min(a*n,b))
import sys
h,w = map(int,input().split())
s = ['']*w
for i in range(h):
  s[i] = input()
 
for i in range(h):
  for j in range(w):
    if s[i][j] == '#':
      if j != w - 1:
        if s[i][j + 1] == '#':
          continue
      elif  j != 0:
        if s[i][j - 1] == '#':
          continue
      elif i != h - 1:
        if s[i + 1][j] == '#':
          continue
      elif i != 0:
        if s[i - 1][j] == '#':
          continue
      else:
        print('No')
        sys.exit()
print('Yes')

### FIXED CODE ###

import sys
h,w = map(int,input().split())
s = ['']*h
for i in range(h):
  s[i] = input()
 
black = False
for i in range(h):
  for j in range(w):
    if s[i][j] == '#':
      if j != w - 1:
        if s[i][j + 1] == '#':
          continue
      if  j != 0:
        if s[i][j - 1] == '#':
          continue
      if i != h - 1:
        if s[i + 1][j] == '#':
          continue
      if i != 0:
        if s[i - 1][j] == '#':
          continue
      print('No')
      sys.exit()       
print('Yes')
N=int(input())
Xl=list(map(int,list(input())))
#X=int(input())
#print(Xl)

def func(x):
  cnt=0
  while x>0:
    num1=0
    xcopy=x
    while xcopy:
      if xcopy&1:
        num1+=1
      xcopy>>=1
      
    #print(x,num1)
    x=x%num1
    cnt+=1
  return cnt

func_dic={}
for i in range(N+1):
  func_dic[i]=func(i)
#print(func_dic)

num1_X=Xl.count(1)
#print(num1_X)

mod_nminus=0
mod_nplus=0
for i in range(N):
  mod_nminus*=2
  mod_nplus*=2
  if Xl[i]==1:
    mod_nminus+=1
    mod_nplus+=1

  mod_nminus%=num1_X-1
  mod_nplus%=num1_X+1
#print(mod_nminus,mod_nplus)

answer_list=[]
modpow_plus=1
modpow_minus=1
for i in reversed(range(N)):
  if Xl[i]==0:
    mod=(mod_nplus+modpow_plus)%(num1_X+1)
    answer_list.append(func_dic[mod]+1)
  else:
    if num1_X-1==0:
      answer_list.append(0)
    else:
      mod=(mod_nminus-modpow_minus)%(num1_X-1)
      answer_list.append(func_dic[mod]+1)
  
  modpow_plus*=2  
  modpow_plus%=num1_X+1
  if num1_X-1>0:
    modpow_minus*=2
    modpow_minus%=num1_X-1
  
for i in reversed(range(N)):
  print(answer_list[i])

### FIXED CODE ###

N=int(input())
Xl=list(map(int,list(input())))
#X=int(input())
#print(Xl)

def func(x):
  cnt=0
  while x>0:
    num1=0
    xcopy=x
    while xcopy:
      if xcopy&1:
        num1+=1
      xcopy>>=1
      
    #print(x,num1)
    x=x%num1
    cnt+=1
  return cnt

func_dic={}
for i in range(N+1):
  func_dic[i]=func(i)
#print(func_dic)

num1_X=Xl.count(1)
#print(num1_X)

mod_nminus=0
mod_nplus=0
for i in range(N):
  if num1_X-1>0:
    mod_nminus*=2
  mod_nplus*=2  
  if Xl[i]==1:
    mod_nminus+=1
    mod_nplus+=1

  if num1_X-1>0:
    mod_nminus%=num1_X-1
  mod_nplus%=num1_X+1
  
#print(mod_nminus,mod_nplus)

answer_list=[]
modpow_plus=1
modpow_minus=1
for i in reversed(range(N)):
  if Xl[i]==0:
    mod=(mod_nplus+modpow_plus)%(num1_X+1)
    answer_list.append(func_dic[mod]+1)
  else:
    if num1_X-1==0:
      answer_list.append(0)
    else:
      mod=(mod_nminus-modpow_minus)%(num1_X-1)
      answer_list.append(func_dic[mod]+1)
  
  modpow_plus*=2  
  modpow_plus%=num1_X+1
  if num1_X-1>0:
    modpow_minus*=2
    modpow_minus%=num1_X-1
  
for i in reversed(range(N)):
  print(answer_list[i])
a = int(input())
b = int(input())
al = [1,2,3]

remain = al.remove(a)
re_remain = remain.remove(b)
print(re_remain)


### FIXED CODE ###

a = int(input())
b = int(input())
al = [1,2,3]

al.remove(a)
al.remove(b)
print(al[0])
from collections import deque

def main():
    process_count, process_time, processes = get_input()
    result =  run_roundrobin(processes = processes, time = process_time)
    for r in result:
        print(r.name, r.time)


def run_roundrobin(processes, time, total_time = 0, result=[]):
    if not processes:
        return result

    p = processes.popleft()
    if p.time <= time:
        total_time += p.time
        p.time = total_time
        result.append(p)
    else:
        total_time += time
        p.time -= time
        processes.append(p)

    return run_roundrobin(processes, time, total_time, result)



def get_input():
    count, time = list(map(lambda x: int(x), input().split(' ')))

    processes = deque([])
    for _ in range(count):
        im = input().split(' ')
        p = Process(im[0], int(im[1]))
        processes.append(p)

    return count, time, processes


class Process():

    def __init__(self, name, time):
        self.name = name
        self.time = time


main()

### FIXED CODE ###

from collections import deque


def main():
    process_count, process_time, processes = get_input()
    result = run_roundrobin(processes=processes, time=process_time)
    for r in result:
        print(r.name, r.time)


def run_roundrobin(processes, time, total_time=0, result=[]):
    while processes:
        p = processes.popleft()
        if p.time <= time:
            total_time += p.time
            p.time = total_time
            result.append(p)
        else:
            total_time += time
            p.time -= time
            processes.append(p)

    return result


def get_input():
    count, time = list(map(lambda x: int(x), input().split(' ')))

    processes = deque([])
    for _ in range(count):
        im = input().split(' ')
        p = Process(im[0], int(im[1]))
        processes.append(p)

    return count, time, processes


class Process():

    def __init__(self, name, time):
        self.name = name
        self.time = time


main()
N = int(input())
H = list(map(int,input().split()))
i = 0
H[0] -= 1
while True:
    
    if H[i]<H[i+1]:
        H[i+1] -= 1
  
    if H[i]>H[i+1]:
        answer = 'No'
        break
    
    i += 1
    if i == N-1:
        answer = 'Yes'
        break
print(answer)

### FIXED CODE ###

N = int(input())
H = list(map(int,input().split()))
i = 0
H[0] -= 1

while True:
    if N == 1:
        answer = 'Yes'
        break
    if H[i]<H[i+1]:
        H[i+1] -= 1
    if H[i]>H[i+1]:
        answer = 'No'
        break
    i += 1
    if i == N-1:
        answer = 'Yes'
        break
print(answer)
N = int(input())

s = map(int,input().split())

s.sort()

sum = 0

for i in range(N):
  sum = sum + s[2*i]

print(sum)

### FIXED CODE ###

N = int(input())

s = list(map(int,input().split()))

s.sort()

sum = 0

for i in range(N):
  sum = sum + s[2*i]

print(sum)
a,b,c = map(int,input().split())
if a == b == c:
  print(1)
elif a == b or b == c or c == a:
  print(2)
elif:
  print(3)

### FIXED CODE ###

a,b,c = map(int,input().split())
if a == b == c:
  print(1)
elif a == b or b == c or c == a:
  print(2)
else:
  print(3)
i = int(input())
lst = []
while i > 0:
    lst.append(i%10)
    i //= 10 
lst.reverse()
a=lst[0]
b=lst[1]
c=lst[2]
d=lst[3]
sa=str(a)
sb=str(b)
sc=str(c)
sd=str(d)

if(a+b+c+d==7):
    print(sa+"+"+sb+"+"+sc+"+"+sd+"=7")
elif (a+b+c-d==7):
    print(sa+"+"+sb+"+"+sc+"-"+sd+"=7")
elif (a+b-c+d==7):
    print(sa+"+"+sb+"-"+sc+"+"+sd+"=7")
elif(a-b+c+d==7):
    print(sa+"-"+sb+"+"+sc+"+"+sd+"=7")
elif(a-b-c+d==7):
    print(sa+"-"+sb+"-"+sc+"+"+sd+"=7")
elif(a-b+c-d==7):
    print(sa+"-"+sb+"+"+sc+"-"+sd+"=7")
elif(a+b-c-d==7):
    print(sa+"+"+sb+"-"+sc+"-"+sd+"=7")
elif(a-b-c-d==7):
    print(sa+"-"+sb+"-"+sc+"-"+sd+"=7")


### FIXED CODE ###

i = input()

a=int(i[0])
b=int(i[1])
c=int(i[2])
d=int(i[3])
sa=i[0]
sb=i[1]
sc=i[2]
sd=i[3]

if(a+b+c+d==7):
    print(sa+"+"+sb+"+"+sc+"+"+sd+"=7")
elif (a+b+c-d==7):
    print(sa+"+"+sb+"+"+sc+"-"+sd+"=7")
elif (a+b-c+d==7):
    print(sa+"+"+sb+"-"+sc+"+"+sd+"=7")
elif(a-b+c+d==7):
    print(sa+"-"+sb+"+"+sc+"+"+sd+"=7")
elif(a-b-c+d==7):
    print(sa+"-"+sb+"-"+sc+"+"+sd+"=7")
elif(a-b+c-d==7):
    print(sa+"-"+sb+"+"+sc+"-"+sd+"=7")
elif(a+b-c-d==7):
    print(sa+"+"+sb+"-"+sc+"-"+sd+"=7")
elif(a-b-c-d==7):
    print(sa+"-"+sb+"-"+sc+"-"+sd+"=7")
import fractions

N=int(input())
T0=int(input())
for i in range(1,N):
    T=int(input())
    g=fractions.gcd(T0,T)
    ans=T0*(T//g)
    T0=ans
print(ans)

### FIXED CODE ###

import fractions

N=int(input())
T0=int(input())

if N==1:
  print(T0)
  exit()

for i in range(1,N):
    T=int(input())
    g=fractions.gcd(T0,T)
    ans=T0*T//g
    T0=ans
print(ans)
import sys
sys.setrecursionlimit(4100000)
import collections
from math import factorial
n = int(input())
A = [str(input()) for _ in range(n)]
for i in range(len(A)):
    A[i] = "".join(sorted(A[i]))
A = sorted(A)
temp = A[0]
counter = 1
ans = 0
for i in range(1,len(A)):
    if temp != A[i]:
        if counter >= 2:
            ans += factorial(counter) / factorial(2) / factorial(counter-2)
        temp = A[i]
        counter = 1
    else:
        counter += 1
if counter >= 2:
    ans += factorial(counter) / factorial(2) / factorial(counter-2)

print(int(ans))

### FIXED CODE ###

import sys
sys.setrecursionlimit(4100000)
import collections
from math import factorial
from operator import mul
from functools import reduce
def cmb(n,r):
    r = min(n-r,r)
    if r == 0: return 1
    over = reduce(mul, range(n, n - r, -1))
    under = reduce(mul, range(1,r + 1))
    return over // under

n = int(input())
A = [str(input()) for _ in range(n)]
for i in range(len(A)):
    A[i] = "".join(sorted(A[i]))
A = sorted(A)
temp = A[0]
counter = 1
ans = 0
for i in range(1,len(A)):
    if temp != A[i]:
        if counter >= 2:
            # ans += factorial(counter) / factorial(2) / factorial(counter-2)
            ans += cmb(counter,2)
        temp = A[i]
        counter = 1
    else:
        counter += 1
if counter >= 2:
    # ans += factorial(counter) / factorial(2) / factorial(counter-2)
    ans += cmb(counter,2)
print(int(ans))
N,A=int(input()),input().split(" ")
for n in range(1,N):
    print(A.count(str(n)))

### FIXED CODE ###

print(float(input())*2*3.14)
n,a,b,c,d = map(int,input().split())
sub = "#"+input()
s = list(sub)

con = True
for i in range(a,d+1):
    if s[i-1]=="#" and s[i]=="#":
        print("No")
        con = False
        break

if (con):
    if (c<b) or (c<d):
        print("Yes")
        con = False

if (con):
    for i in range(b-1,c):
        if s[i]=="." and s[i+1]=="." and s[i+2]==".":
            print("Yes")
            con = False
            break

if (con):
    print("No")



### FIXED CODE ###

n,a,b,c,d = map(int,input().split())
sub = "#"+input()
s = list(sub)

con = True
for i in range(a,d+1):
    if s[i-1]=="#" and s[i]=="#":
        print("No")
        con = False
        break

if (con):
    if (c<b) or (c<d):
        print("Yes")
        con = False

if (con):
    for i in range(b-1,d):
        if s[i]=="." and s[i+1]=="." and s[i+2]==".":
            print("Yes")
            con = False
            break

if (con):
    print("No")
import math
n = int(input())

pt = [0] * n
pa = [0] * n

for i in range(n):
  t, a = map(int, input().split())
  if i == 0:
    pt[0] = t
    pa[0] = a
  else:
    tmp = math.ceil(max([pt[i-1]/t*1.0, pa[i-1]a*1.0]))
    pt[i]=tmp*t
    pa[i]=tmp*a

print(int(pt[-1] + pa[-1]))      

### FIXED CODE ###

import math
from fractions import Fraction
n = int(input())

pt = [0] * n
pa = [0] * n

for i in range(n):
  t, a = map(int, input().split())
  if i == 0:
    pt[0] = t
    pa[0] = a
  else:
    tmp = math.ceil(max(Fraction(pt[i-1], t), Fraction(pa[i-1], a)))
    pt[i]=tmp*t
    pa[i]=tmp*a

print(int(pt[-1] + pa[-1]))
a =input()
s =input()
if(a<=3200):
	print("red")
print(pink)

### FIXED CODE ###

a = int(input())
s = input()
if a>=3200:print(s)
else:print("red")
import math
N = int(input())

sum = list(range(N))

print(sum)

### FIXED CODE ###


import math
N = int(input())
print(int(N * (N - 1) // 2))
input_str = input()

split_list = input_str.split()

print((int(split_list[0]) * int(split_list[1]),)

print(" ",)

print((int(split_list[0]) * 2 + int(split_list[1]) * 2))
 

### FIXED CODE ###

input_str = input()

split_list = input_str.split()

print(int(split_list[0]) * int(split_list[1]), int(split_list[0]) * 2 + int(split_list[1]) * 2)
from collections import defaultdict, deque

n, m = [int(i) for i in raw_input().split()]

# children = defaultdict(list)
parents = defaultdict(list)

for _ in range(m):
    u, v = [int(i) for i in raw_input().split()]
    # children[u-1].append(v-1)
    parents[v-1].append(u-1)

def longest_path(parents, n):
    f = [-1] * n
    # targets = [x for y in children.values() for x in y]
    # starts = [v for v in range(n) if v not in targets]

    # print f
    for i in range(n):
        get_f(parents, f, i)

    # print f
    return max(f)

def get_f(parents, f, i):
    if f[i] != -1:
        return f[i]

    f[i] = 0
    for v in parents[i]:
        f[i] = max(f[i], get_f(parents, f, v) + 1)

    return f[i]

# def longest_path(children, parents, n):
#     targets = [x for y in children.values() for x in y]
#     starts = [v for v in range(n) if v not in targets]
#     f = [None] * n
    
#     Q = deque([])
#     for v in starts:
#         f[v] = 0
#         Q.append((v, 0))

#     output = 0
#     while len(Q) > 0:
#         node, length = Q.pop()
#         output = max(output, length)
#         for v in children[node]:
#             Q.append((v, length+1))

#     return output

print(longest_path(parents, n))


### FIXED CODE ###

from collections import defaultdict
import sys
sys.setrecursionlimit(1000000)

n, m = [int(i) for i in raw_input().split()]
parents = defaultdict(list)

i = 0
while i < m:
    u, v = [int(x) for x in raw_input().split()]
    parents[v-1].append(u-1)
    i += 1

def calc_f(parents, f, i):
    if i < 0 or i >= len(f):
        return 0

    if f[i] != -1:
        return f[i]

    f[i] = 0
    for v in parents[i]:
        f[i] = max(f[i], calc_f(parents, f, v)+1)

    return f[i]

f = [-1] * n
j = 0
while j < n:
    calc_f(parents, f, j)
    j += 1

if len(f) == 0:
    print 0
else:
    print max(f)
from operator import itemgetter
import  numpy as np
import sys

input = sys.stdin.readline
n,m = map(int,input().split())

in_p = []
in_y = []
in_num = [0] * n

p = np.zeros((n,m))

for i in range(m):
    a,b = map(int,input().split())
    in_p.append(a)
    in_y.append(b)
    p[a-1,i]= b
    in_num[a-1]+=1

p_sort=np.sort(p,axis=1)
in_num = np.array(in_num)
in_num = m - in_num
for i in range(m):
    year=str(in_p[i]).zfill(6)
    a =  np.where(p_sort == in_y[i])
    b = int(a[1] - in_num[int(a[0])]+1 )
    print("{0}{1}\n".format(year,str(b).zfill(6)))

### FIXED CODE ###

import copy

n,m = map(int,input().split())

cnt = [0]*(10**5+4)

yy = []
yp = []
for _ in range(m):
    a,b = map(int,input().split())
    a,b = b,a
    yy.append([a,0])
    yp.append([a,b])

inlist = copy.deepcopy(yp)
yp.sort()
yy = dict(yy)

for i in range(m):
    cnt[yp[i][1]]+=1
    yy[yp[i][0]] = cnt[yp[i][1]]

for key,value in inlist:
    print("{:06}{:06}".format(value,yy[key]))
def mi(): return map(int,input().split())
def lmi(): return list(map(int,input().split()))
def ii(): return int(input())
def isp(): return input().split()

n=ii()
a=lmi()
suma=sum(a)
Counter=[0]*(10**5)
for i in a:
  Counter[i]+=1
#print(Counter)
q=ii()

for i in range(q):
  b,c=mi()
  suma-=b*counter[b]
  suma+=c*counter[b]
  
  Counter[c]+=Counter[b]
  Counter[b]=0
  #print(Counter)
  print(suma)
  
    

### FIXED CODE ###

n=int(input())
a=list(map(int,input().split()))
suma=sum(a)
q=int(input())
b=[]
c=[]
for i in range(q):
  b_,c_=map(int,input().split())
  b.append(b_)
  c.append(c_)

counter=[0]*(10**5+1)
for i in a:
  counter[i]+=1
new_sum=suma
for i in range(q):
  new_sum=new_sum-b[i]*counter[b[i]]+c[i]*counter[b[i]]
  
  counter[c[i]]+=counter[b[i]]
  counter[b[i]]=0
  print(new_sum)
ii = lambda : int(input())
mi = lambda : map(int,input().split())
li = lambda : list(map(int,input().split()))

import numpy as np

n = ii()
print(n*2*np.pi)

### FIXED CODE ###

ii = lambda : int(input())
mi = lambda : map(int,input().split())
li = lambda : list(map(int,input().split()))

import numpy as np

n = ii()
print(n*2*np.pi)
n, p = map(int, input().split())
s = input()
count = 0
if p == 2 or p == 5:
  for i in s:
    if int(i) % p == 0:
      count += i + 1
  print(count)
else:
  mod = [0] * p
  mod[0] = 1
  tmp = 0
  ten = 1
  for i in s[::-1]:
    ten = ten * 10 % p
    tmp = (tmp + int(i) * ten) % p
    mod[tmp] += 1
  for m in mod:
    count += m * (m - 1) // 2
  print(count)

### FIXED CODE ###

n, p = map(int, input().split())
s = input()
count = 0
if p == 2 or p == 5:
  for i in range(n):
    if int(s[i]) % p == 0:
      count += i + 1
  print(count)
else:
  mod = [0] * p
  mod[0] = 1
  tmp = 0
  ten = 1
  for i in s[::-1]:
    ten = ten * 10 % p
    tmp = (tmp + int(i) * ten) % p
    mod[tmp] += 1
  for m in mod:
    count += m * (m - 1) // 2
  print(count)
N=int(input())
A=list(map(int,input().split()))
print(*A[::-2],*A[N%2::2])

### FIXED CODE ###

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

right = []
left = []
for i in range(N):
    if i % 2 == 0:
        right.append(A[i])
    else:
        left.append(A[i])
answer = left[::-1]
answer += right
if N%2 == 1:
  answer = answer[::-1]
print(*answer)
n=int(input())
def t(n):
    if n < 1:
        return 0
    return n + t(n - 1)
print(t(n)-3*t(n//3)-5*t(n//5)+15*t(n//15))

### FIXED CODE ###

n=int(input())
def t(k):
  return k*(k+1)//2
print(t(n)-3*(t(n//3))-5*(t(n//5))+15*(t(n//15)))