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

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


def dfs(now, count):
    if count > 2:
        pass
    else:
        visit[now] = 1
        for x in graph[now]:
            dfs(x, count + 1)


flag = False
if ab[0][0] == 1:
    graph = [[] for _ in range(n + 1)]
    for a, b in ab:
        graph[a].append(b)
        graph[b].append(a)

    visit = [0] * (n + 1)
    visit[1] = 1

    dfs(1, 0)

    if visit[n] == 1:
        flag = True

print('POSSIBLE') if flag else print('IMPOSSIBLE')


### FIXED CODE ###

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


def dfs(now, count):
    if count <= 2 and visit[n] == 0:
        visit[now] = 1
        if count <= 1:
            for x in graph[now]:
                dfs(x, count + 1)


flag = False
if ab[0][0] == 1:
    graph = [[] for _ in range(n + 1)]
    for a, b in ab:
        graph[a].append(b)
        graph[b].append(a)

    visit = [0] * (n + 1)
    dfs(1, 0)

    if visit[n] == 1:
        flag = True

print('POSSIBLE') if flag else print('IMPOSSIBLE')
### BUGGY CODE ###

l, r = map(int, input().split())
ans = 9999
for i in range(l, r):
    for j in range(l + 1, r + 1):
        # print(i, j, (i*j) % 2019)
        if (i * j) % 2019 < ans:
            ans = (i * j) % 2019
print(ans)

### FIXED CODE ###

l, r = map(int, input().split())
ans = 9999
r = min(r, l+4038)
for i in range(l, r):
    for j in range(i + 1, r+1):
        if (i * j) % 2019 < ans:
            ans = (i * j) % 2019
print(ans)
### BUGGY CODE ###

import collections

S = list(input())
a=[int(x) for x in S] #int型のリストに変換
a.reverse()
#print(a)

n=len(a)
T=[0]*n

T[0]=a[0]

for i in range(1,n):
    T[i]=T[i-1]+(a[i]*10**i)

#print(T)
L=list()
for i in range(n):
    L.append(T[i]%2019)
   

#print(L)
c = collections.Counter(L)

#出現回数が2回以上のものの出現数 + 0の出現回数
print(int(len([i[0] for i in c.items() if i[1] >= 2])) + int(len([i for i in L if i==0])))

### FIXED CODE ###

S = list(input())
a=[int(x) for x in S] #int型のリストに変換
a.reverse()
#print(a)
l=[0]*2019
l[0]=1
T=0
d=1

for i in a:
    T+=(int(i)*d)
    T%=2019
    l[T]+=1
    d*=10
    d%=2019
result=0
for n in l:
    result+=n*(n-1)/2
print(int(result))
### BUGGY CODE ###

import collections
n=int(input())
s=[input() for i in range(n)]

c=collections.Counter(s)

m=[]

for v in c.values():
    m.append(v)

keys=[k for k, v in c.items() if v==max(m)]

keys.sort()

print('\n'.join(keys))

### FIXED CODE ###

n= int(input())
l={}
a=0

for i in range(n):
  s=input()
  if s in l:
    l[s]+=1
  else:
    l[s]=1
  if a<l[s]:
    a=l[s]
  
ans=[]
for i in l.keys():
  if l[i]==a:
    ans.append(i)

ans.sort()
for j in ans:
  print(j)
### BUGGY CODE ###

#!/usr/bin/env python3
import sys
from collections import defaultdict, deque

YES = "Yes"  # type: str
NO = "No"  # type: str

def solve(N: int, M: int, L: "List[int]", R: "List[int]", D: "List[int]"):
    visited = [False] * N
    pos = [None] * N
    adj = defaultdict(set)

    for l, r, d in zip(L, R, D):
        adj[l].add((r, d))
        adj[r].add((l, -d))
    
    for i, vis in enumerate(visited):
        if vis:
            continue
        pos[i] = 0
        Q = deque([i], M)
        while len(Q) > 0:
            u = Q.popleft()
            visited[u] = True
            for v, d in adj[u]:
                if pos[v] is None:
                    pos[v] = pos[u] + d
                elif pos[v] != pos[u] + d:
                    print(NO)
                    return

                if visited[v]:
                    continue
                Q.append(v)
    print(YES)
    return


# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    M = int(next(tokens))  # type: int
    L = [int()] * (M)  # type: "List[int]" 
    R = [int()] * (M)  # type: "List[int]" 
    D = [int()] * (M)  # type: "List[int]" 
    for i in range(M):
        L[i] = int(next(tokens)) - 1
        R[i] = int(next(tokens)) - 1
        D[i] = int(next(tokens))
    solve(N, M, L, R, D)

if __name__ == '__main__':
    main()


### FIXED CODE ###

#!/usr/bin/env python3
import sys
from collections import defaultdict, deque

YES = "Yes"  # type: str
NO = "No"  # type: str

def solve(N: int, M: int, adj):
    visited = [False] * N
    pos = [None] * N

    for i, vis in enumerate(visited):
        if vis:
            continue
        pos[i] = 0
        visited[i] = True
        Q = deque([i], M)
        while len(Q) > 0:
            u = Q.popleft()
            for v, d in adj[u]:
                if pos[v] is None:
                    pos[v] = pos[u] + d
                elif pos[v] != pos[u] + d:
                    print(NO)
                    return

                if visited[v]:
                    continue
                Q.append(v)
                visited[v] = True
    print(YES)
    return


# Generated by 1.1.4 https://github.com/kyuridenamida/atcoder-tools  (tips: You use the default template now. You can remove this line by using your custom template)
def main():
    def iterate_tokens():
        for line in sys.stdin:
            for word in line.split():
                yield word
    tokens = iterate_tokens()
    N = int(next(tokens))  # type: int
    M = int(next(tokens))  # type: int
    adj = [set() for _ in range(N)]
    for i in range(M):
        l = int(next(tokens)) - 1
        r = int(next(tokens)) - 1
        d = int(next(tokens))
        adj[l].add((r, d))
        adj[r].add((l, -d))
    solve(N, M, adj)

if __name__ == '__main__':
    main()
### BUGGY CODE ###

from collections import deque
from sys import stdin

dx = (1, 0, -1, 0)
dy = (0, 1, 0, -1)

N, M = [int(_) for _ in stdin.readline().rstrip().split()]
graph = []

def bfs(graph, N, M):
    for _ in range(N):
        n = list(stdin.readline().rstrip())
        graph.append(n)

    ans = 0
    que = deque()
    dist = [[-1 for i in range(M)] for j in range(N)]
    for i in range(N):
        for j in range(M):
            if graph[i][j] == '#':
                que.append((i, j)) 
                dist[i][j] = 0

    while len(que):
        v = que.popleft()
        for d in range(4):
            nx = v[0] + dx[d]
            ny = v[1] + dy[d]
            if nx < 0 or nx >= N or ny < 0 or ny >= M:
                continue
            if dist[nx][ny] == -1:
                dist[nx][ny] = dist[v[0]][v[1]] + 1
                que.append((nx, ny))

    for i in range(N):
        for j in range(M):
            ans = max(ans, dist[i][j])

    return ans

ans = bfs(graph, N, M)
print(ans)

### FIXED CODE ###

from collections import deque
from sys import stdin

dx = (1, 0, -1, 0)
dy = (0, 1, 0, -1)

N, M = [int(_) for _ in stdin.readline().rstrip().split()]
graph = []

def bfs(graph, N, M):
    for _ in range(N):
        n = list(stdin.readline().rstrip())
        graph.append(n)

    ans = 0
    que = deque()
    dist = [[-1 for i in range(M)] for j in range(N)]
    for i in range(N):
        for j in range(M):
            if graph[i][j] == '#':
                que.append((i, j)) 
                dist[i][j] = 0

    while len(que):
        v = que.popleft()
        for d in range(4):
            nx = v[0] + dx[d]
            ny = v[1] + dy[d]
            if nx < 0 or nx >= N or ny < 0 or ny >= M:
                continue
            if dist[nx][ny] == -1:
                dist[nx][ny] = dist[v[0]][v[1]] + 1
                que.append((nx, ny))

    for i in range(N):
        for j in range(M):
            ans = max(ans, dist[i][j])

    return ans

ans = bfs(graph, N, M)
print(ans)
### BUGGY CODE ###

#!usr/bin/env python3
from collections import defaultdict
from collections import deque
from heapq import heappush, heappop
import sys
import math
import bisect
import random
def LI(): return list(map(int, sys.stdin.readline().split()))
def I(): return int(sys.stdin.readline())
def LS():return list(map(list, sys.stdin.readline().split()))
def S(): return list(sys.stdin.readline())[:-1]
def IR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = I()
    return l
def LIR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = LI()
    return l
def SR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = S()
    return l
def LSR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = LS()
    return l
sys.setrecursionlimit(1000000)
mod = 1000000007
dire4 = [(1,0), (0,1), (-1,0), (0,-1)]
dire8 = [(1, 0), (1, 1), (0, 1), (-1, 1), (-1, 0), (-1, -1), (0, -1), (1, -1)]

N = I()
abc = LIR(N-1)
Q, K = LI()
xy = LIR(Q)

abc = list(map(lambda x: [x[0]-1, x[1]-1, x[2]], abc))
xy = list(map(lambda x: [x[0]-1, x[1]-1], xy))
K = K-1

utov = [[] for i in range(N)]

edge = [[0]*N for i in range(N)]
for a, b, c in abc:
    edge[a][b] = c
    edge[b][a] = c
    utov[a].append(b)
    utov[b].append(a)

bfs_map = [-1]*N

q = deque()
q.append(K)
bfs_map[K] = 0

while q:
    u = q.popleft()
    for v in utov[u]:
        if (bfs_map[v] == -1) or (bfs_map[v] > bfs_map[u]+edge[u][v]):
            bfs_map[v] = bfs_map[u]+edge[u][v]
            q.append(v)

for x, y in xy:
    print(bfs_map[x]+bfs_map[y])


### FIXED CODE ###

#!usr/bin/env python3
from collections import defaultdict
from collections import deque
from heapq import heappush, heappop
import sys
import math
import bisect
import random
def LI(): return list(map(int, sys.stdin.readline().split()))
def I(): return int(sys.stdin.readline())
def LS():return list(map(list, sys.stdin.readline().split()))
def S(): return list(sys.stdin.readline())[:-1]
def IR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = I()
    return l
def LIR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = LI()
    return l
def SR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = S()
    return l
def LSR(n):
    l = [None for i in range(n)]
    for i in range(n):l[i] = LS()
    return l
sys.setrecursionlimit(1000000)
mod = 1000000007
dire4 = [(1,0), (0,1), (-1,0), (0,-1)]
dire8 = [(1, 0), (1, 1), (0, 1), (-1, 1), (-1, 0), (-1, -1), (0, -1), (1, -1)]

N = I()
abc = LIR(N-1)
Q, K = LI()
xy = LIR(Q)


K = K

utov = [[] for i in range(N+1)]
for a, b, c in abc:
    utov[a].append((b,c))
    utov[b].append((a,c))

bfs_map = [-1]*(N+1)

q = deque()
q.append(K)
bfs_map[K] = 0

while q:
    u = q.popleft()
    for v, cost in utov[u]:
        if (bfs_map[v] == -1) or (bfs_map[v] > bfs_map[u]+cost):
            bfs_map[v] = bfs_map[u] + cost
            q.append(v)


for x, y in xy:
    print(bfs_map[x]+bfs_map[y])
### BUGGY CODE ###

import sys
sys.setrecursionlimit(10 ** 6)
# input = sys.stdin.readline    ####
int1 = lambda x: int(x) - 1
def II(): return int(input())

def MI(): return map(int, input().split())
def MI1(): return map(int1, input().split())

def LI(): return list(map(int, input().split()))
def LI1(): return list(map(int1, input().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]

INF = float('inf')

def solve():
    S = list(map(int, list(input())))
    S = S[::-1]
    n = len(S)
    mod = 2019
    A = [0] * n
    times = 1
    for i in range(n):
        A[i] = S[i] * times % mod
        times *= 10

    # 累積和
    R = [0]
    for i in range(n):
        R.append((R[i] + A[i]) % mod)
    # print(R)
    cnt = {}
    ans = 0
    for i in range(n+1):
        r = R[i] % 2019
        # print(r)
        cnt.setdefault(r, 0)
        ans += cnt[r]
        cnt[r] += 1
    # print(cnt)
    print(ans)

if __name__ == '__main__':
    solve()


### FIXED CODE ###

import sys
sys.setrecursionlimit(10 ** 6)
# input = sys.stdin.readline    ####
int1 = lambda x: int(x) - 1
def II(): return int(input())
 
def MI(): return map(int, input().split())
def MI1(): return map(int1, input().split())
 
def LI(): return list(map(int, input().split()))
def LI1(): return list(map(int1, input().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
 
INF = float('inf')
 
def solve():
    S = list(map(int, list(input())))
 
    S = S[::-1]
    # print(S)
    n = len(S)
    mod = 2019
 
    #
    A = [0] * (n)
    a = 1
    for i in range(n):
        A[i] = S[i] * a
        a = a * 10 % mod
    # print(A)
 
    # 累積和
    R = [0] * (n+1)
    for j in range(n):
        R[j+1] = (R[j] + A[j]) % mod
    # print(R)
 
    # 個数を数える
    cnt = {}
    ans = 0
    for l in range(0, n+1):
        r = R[l]
        ans = ans + cnt.get(r, 0)
        cnt[r] = cnt.setdefault(r, 0) + 1
    print(ans)
 
if __name__ == '__main__':
    solve()
### BUGGY CODE ###

# -*- coding: utf-8 -*-

def main():
    # 入力
    st = input()

    if len(st) < 4:
        print(0)
        return

    # 右からi文字目から最後の数字までを数値化したものについてmodを計算していく
    mod_res_dic = {0: [0]}
    for i in range(1, len(st) + 1):
        target_st = st[-i:]
        mod_res = int(target_st) % 2019
        ls = mod_res_dic.setdefault(mod_res, [])
        ls.append(i)
    # print(mod_res_dic)

    # modが同じペアのものについて、iからj文字目までを2019で割り切れるので、その組み合わせを計算
    cnt = 0
    for v in mod_res_dic.values():
        comb = len(v)
        if comb < 2:
            continue
        cnt += (comb * (comb - 1)) / 2

    print(int(cnt))


main()


### FIXED CODE ###

# -*- coding: utf-8 -*-

def main():
    # 入力
    st = input()

    # if len(st) < 4:
    #     print(0)
    #     return

    # 右からi文字目から最後の数字までを数値化したものについてmodを計算していく
    mod_res_dic = {0: [0]}
    tmp_mod_val = 0
    r_st = ''.join(list(reversed(st)))
    cnt = 0
    for i in range(len(r_st)):
        target_st = r_st[i:i+1]
        # mod_res = ((10 ** i) * int(target_st) + tmp_mod_val) % 2019
        tmp_mod_val += int(target_st)*pow(10, i, 2019)
        tmp_mod_val %= 2019
        ls = mod_res_dic.setdefault(tmp_mod_val, [])
        ls.append(i-1)
        if len(ls) > 1:
            cnt += len(ls)-1
        # tmp_mod_val = mod_res

    # print(mod_res_dic)
    # modが同じペアのものについて、iからj文字目までを2019で割り切れるので、その組み合わせを計算
    # cnt = 0
    # for v in mod_res_dic.values():
    #     comb = len(v)
    #     if comb < 2:
    #         continue
    #     cnt += (comb * (comb - 1)) / 2

    print(int(cnt))


main()
### BUGGY CODE ###

n=input()
temp=[]
l=[int(x) for x in input().split()]
for x in l:
	if x not in temp:
		y=l.count(x)
		if y>3:
			temp.append(x)
		if(y>1):
			temp.append(x)
	
if len(temp)<2:
	print(0)
else:
	x=max(temp)
	temp.remove(x)
	print(x*max(temp))


### FIXED CODE ###

n=int(input())
a=[int(x) for x in input().split()]
a.sort()
lar=sec=i=0
while(i<n-1):
    if a[i]==a[i+1]:
        i+=1
        if a[i]>lar:
            sec=lar
            lar=a[i]
        elif a[i]>sec:
             sec=a[i]
    i+=1
print(lar*sec)
### BUGGY CODE ###

import sys
input = sys.stdin.readline
mod = 10**9+7
s = list(input())[:-1]

s = s[::-1]

ls = len(s)

mod_13_list = [ (10**i) % 13 for i in range(6) ]

dp_list = [ 0 for i in range(13) ]
if  s[0] != "?":
    p = int(s[0])
    dp_list[p] += 1
else:
    for i in range(10):
        dp_list[i] += 1

t = 1
for i in range(1,ls):
    r = mod_13_list[t]
    t = ( t + 1 ) % 6
    new_dp_list = [ 0 for i in range(13) ]
    if s[i] != "?":
        p = int(s[i])
        q = ( p * r ) % 13
        for j in range(13):
            new_dp_list[(j+q)%13] += dp_list[j]
    
    else:
        for k in range(10):
            q = (k * r ) % 13
            for j in range(13):
                new_dp_list[(j+q)%13] += dp_list[j]
    
    dp_list = [ i % mod for i in new_dp_list ]

print(dp_list[5])

### FIXED CODE ###

import sys
input = sys.stdin.readline
mod = 10**9+7
s = list(input())[:-1]

s = s[::-1]

ls = len(s)

mod_13_list = [ (10**i) % 13 for i in range(6) ]

dp_list = [ 0 for i in range(13) ]
if  s[0] != "?":
    p = int(s[0])
    dp_list[p] += 1
else:
    for i in range(10):
        dp_list[i] += 1

t = 1
for i in range(1,ls):
    r = mod_13_list[t]
    t = ( t + 1 ) % 6
    new_dp_list = [ 0 for i in range(13) ]
    if s[i] != "?":
        p = int(s[i])
        q = ( p * r ) % 13
        for j in range(13):
            new_dp_list[(j+q)%13] += dp_list[j]
    
    else:
        for k in range(10):
            q = (k * r ) % 13
            for j in range(13):
                new_dp_list[(j+q)%13] += dp_list[j]
    
    dp_list = [ i % mod for i in new_dp_list ]

print(dp_list[5])
### BUGGY CODE ###

S = str(input())
h = [int(x) for x in list(S)]
N = len(h)
a = [0] * 2019
a[0] = 1
T = 0
r = 1
c = 0
for i in range(N-1, -1, -1):
    T = T + h[i] * r
    r = r * 10
    c += a[T%2019]
    a[T%2019] += 1
print(c)

### FIXED CODE ###

S = input()
P = 2019
N = len(S)
num = [0] * P
num[0] = 1
c = 0
ans = 0
dgt = 1
for i in range(N-1, -1, -1):
    c = (c + int(S[i]) * dgt) % P
    dgt *= 10
    dgt %= P
    ans += num[c]
    num[c] += 1

print(ans)
### BUGGY CODE ###

import heapq
import sys
sys.setrecursionlimit(10**9)
input=sys.stdin.readline

N=int(input())

xylist,yxlist=[],[]
par_dic={}
for i in range(N):
  x,y=map(int,input().split())
  xylist.append((x,y))
  yxlist.append((y,x))
  par_dic[(x,y)]=(x,y)
xylist.sort()
yxlist.sort()
#print(xylist)

hq=[]
for i in range(1,N):
  x1,y1=xylist[i-1]
  x2,y2=xylist[i]
  heapq.heappush(hq,(min(abs(x2-x1),abs(y1-y2)),(x1,y1),(x2,y2)))
  y1,x1=yxlist[i-1]
  y2,x2=yxlist[i]
  heapq.heappush(hq,(min(abs(x2-x1),abs(y1-y2)),(x1,y1),(x2,y2)))
#print(hq)

def get_par(x):
  if x == par_dic[x]:
    return x
  else:
    par_dic[x] = get_par(par_dic[x])
    return par_dic[x]
def merge(x,y):
  par_x = get_par(x)
  par_y = get_par(y)
  if par_x != par_y:
    par_dic[par_y] = par_x
def is_same(x,y):
  return get_par(x) == get_par(y)

answer=0
while hq:
  d,p1,p2=heapq.heappop(hq)
  #print(d,p1,p2)
  if not is_same(p1,p2):
    merge(p1,p2)
    answer+=d
  
print(answer)

### FIXED CODE ###

import sys
sys.setrecursionlimit(10**9)
input=sys.stdin.readline

N=int(input())

xylist,yxlist=[],[]
par_dic={}
for i in range(N):
  x,y=map(int,input().split())
  xylist.append((x,y))
  yxlist.append((y,x))
  par_dic[(x,y)]=(x,y)
xylist.sort()
yxlist.sort()
#print(xylist)

elist=[]
for i in range(1,N):
  x1,y1=xylist[i-1]
  x2,y2=xylist[i]
  elist.append((min(abs(x2-x1),abs(y1-y2)),(x1,y1),(x2,y2)))
  y1,x1=yxlist[i-1]
  y2,x2=yxlist[i]
  elist.append((min(abs(x2-x1),abs(y1-y2)),(x1,y1),(x2,y2)))
#print(hq)
elist.sort(reverse=True)

def get_par(x):
  if x == par_dic[x]:
    return x
  else:
    par_dic[x] = get_par(par_dic[x])
    return par_dic[x]
def merge(x,y):
  par_x = get_par(x)
  par_y = get_par(y)
  if par_x != par_y:
    par_dic[par_y] = par_x
def is_same(x,y):
  return get_par(x) == get_par(y)

answer=0
while elist:
  d,p1,p2=elist.pop()
  #print(d,p1,p2)
  if not is_same(p1,p2):
    merge(p1,p2)
    answer+=d
  
print(answer)
### BUGGY CODE ###

N = int(input())
A = list(map(int, input().split()))
MOD = 10 ** 9 + 7

ans = [
  A[i]^A[j] for i in range(N) for j in range(i+1, N)
]
'''for i in range(N):
  for j in range(i+1, N):
    ans += A[i]^A[j]'''
    
print(sum(ans)%MOD)

### FIXED CODE ###

import sys
sys.setrecursionlimit(10 ** 6)
input = sys.stdin.readline

N = int(input())
A = list(map(int, input().split()))
MOD = 10**9+ 7

ans = 0
two = 1
for i in range(61):
  n = len([ a for a in A if (a >> i) & 1 ])
  ans += (n * (N - n) * two % MOD)
  two *= 2 
print(ans%MOD)
### BUGGY CODE ###

import numpy as np
n=int(input())
a=np.array(list(map(lambda x:list(map(int,list(('0'*62+bin(int(x))[2:])[-62:]))),input().split())),np.int64)
mod=pow(10,9)+7
b=np.sum(a,axis=0)
ans=0
for i in range(61):# 2^iの位
  ans+=(pow(2,i,mod)*b[-i-1]*(n-b[-i-1]))%mod
  ans%=mod
print(ans)

### FIXED CODE ###

import sys
input = sys.stdin.readline
def main():
  n=int(input())
  a=list(map(int,input().split()))
  mod=pow(10,9)+7
  ans=0
  bit=[0]*61 #bit[i]:2^iの位が1である物の個数
  for ai in a:
    for j in range(61):
      if ((ai>>j) & 1):
        bit[j]+=1
  for i in range(61):
    ans+=(pow(2,i)%mod)*bit[i]*(n-bit[i])
    ans%=mod
  print(ans)
if __name__=='__main__':
  main()
### BUGGY CODE ###

# from math import factorial,sqrt
# from itertools import permutations as permus
# from fractions import gcd
from collections import deque,Counter
# from decimal import Decimal, getcontext
# # getcontext().prec = 1000
# # eps = Decimal(10) ** (-100)

# import numpy as np
# import scipy as scp

# 入力の受け取り
n = int(input())
# 列ベクトルとかの受け取り
lists = [Counter(input()) for _ in range(n)]

check = []

ans = 0
i = 0
while i < len(lists):
    j = i+1
    while j <len(lists):
        if lists[i] == lists[j]:
            ans += 1
        j += 1
    i += 1

print(ans)
# print("{:.10f}".format(ans))
# print(*ans)   # unpackして出力。間にスペースが入る
# for row in board:
#     print(*row,sep="")    #unpackして間にスペース入れずに出力する



### FIXED CODE ###

# from math import factorial,sqrt
# from itertools import permutations as permus
# from fractions import gcd
from collections import deque,Counter
# from decimal import Decimal, getcontext
# # getcontext().prec = 1000
# # eps = Decimal(10) ** (-100)

# import numpy as np
# import scipy as scp

# 入力の受け取り
n = int(input())
# 列ベクトルとかの受け取り
lists = ["".join(sorted(list(input()))) for _ in range(n)]

strcount = Counter(lists)

ans = 0
for i,n in strcount.items():
    if n == 1:
        continue
    else:
        ans += n*(n-1)/2

ans = int(ans)
print(ans)
# print("{:.10f}".format(ans))
# print(*ans)   # unpackして出力。間にスペースが入る
# for row in board:
#     print(*row,sep="")    #unpackして間にスペース入れずに出力する
### BUGGY CODE ###


n = int(input())

line=[]

for i in range(n):
    string = list(input())
    string.sort()
    line.append(''.join(string))

line_set = set(line)

c=0
k=None

for i in line_set:
    k = line.count(i)
    k = k*(k-1)//2
    c+=k

print(c)

### FIXED CODE ###

n = int(input())

line={}
c=0

for i in range(n):
    string = ''.join(sorted(list(input())))
    # print(string)
    if string in line:
        c+=line[string]
    if string in line:
        line[string]+=1
    else:
        line[string]=1
    # print(line,c)

print(c)
### BUGGY CODE ###

N=int(input())
P=list(map(int,input().split()))
ans = 0
for i in range(N):
    if i == 0:
        ans += 1
    else:
        #print(P[0:i+1],P[i],min(P[0:i+1]),i)
        if min(P[0:i+1]) == P[i]:
            ans += 1
print(ans)


### FIXED CODE ###

N=int(input())
P=list(map(int,input().split()))
ans = 0
for i in range(N):
    if i == 0:
        ans += 1
        mini = P[0]
    else:
        if mini >= P[i]:
            mini = P[i]
            ans += 1
        #print(P[0:i+1],P[i],min(P[0:i+1]),i)
        #if min(P[0:i+1]) == P[i]:
            #ans += 1
print(ans)
### BUGGY CODE ###

import math
import copy

m=int(input())
a=list(map(int,input().split()))
total=0
count=0
for i in range(m):
    b = copy.copy(a)
    del b[i]
    for j in range(m-1):
       c = b.count(j+1)
       if c>1:
          count = math.factorial(c)//math.factorial(2)//math.factorial(c-2)
          total = total + count
          count=0
    print(total)
    total=0

### FIXED CODE ###

import math
import collections
m=int(input())
a=list(map(int,input().split()))
A=collections.Counter(a)
total=0
for j in A.values():
    total = total + j*(j-1)//2
for k in range(m):
    s=A[a[k]]
    d=total-s+1
    print(d)
### BUGGY CODE ###

A,B,C,K = map(int, input().split())

total = 0
count = 0
for a in range(A):
  total += 1
  count += 1
  if count == K:
    print(total)
    quit()
    
for b in range(B):
  count += 1
  if count == K:
    print(total)
    quit()
    
for c in range(C):
  total -= 1
  count += 1
  if count == K:
    print(total)
    quit()

### FIXED CODE ###

A,B,C,K = map(int, input().split())

if A >= K:
  print(K)
elif A + B >= K > A:
  print(A)
else:
  print(A - (K - A - B))