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

N,M= map(int, input().split())
li=[]
for i in range(N):
    li.append(0)
L,R= map(int, input().split())
for i in range(L-1,R):
    li[i] = 1
for i in range(M-1):
    L,R= map(int, input().split())
    for t in range(0,L-1):
        li[t] = 0
    for t in range(R,len(li)):
        li[t] = 0
print(li.count(1))

### FIXED CODE ###

N,M= map(int, input().split())
L,R= map(int, input().split())
flag = True
for i in range(M-1):
    a,b= map(int, input().split())
    if a >= L and b <= R:
        L = a
        R = b
    elif L <= b and R >= b:
        R = b
    elif L <= a and R >= a:
        L = a
    elif a < L and R < b:
        L = L
    else:
        flag = False
        break
if flag:
 print(R-L+1)
else:
    print(0)
### BUGGY CODE ###

n,q=map(int,input().split())
s=input()
lr=[]
for _ in range(q):
  lr.append(list(map(int,input().split())))
for i in range(q):
  t=s[lr[i][0]-1:lr[i][1]]
  print(t.count('AC'))


### FIXED CODE ###

n,q=map(int,input().split())
s=input()
lr=[]
for _ in range(q):
  lr.append(list(map(int,input().split())))
sa=[0,0]
c=0
for i in range(1,n):
  if s[i-1]+s[i]=='AC':
    c+=1
  sa.append(c)
for i in range(q):
  t=sa[lr[i][1]]-sa[lr[i][0]]
  print(t)
### BUGGY CODE ###

n=int(input())
d=list(map(int,input().split()))
if n>=24:
    print(0)
    exit()
op=2**n-1
ans=0
for i in range(op):
    t=[0]
    for j in range(n):
        if i&(2**j)>0:
            t.append(d[j])
        else:
            t.append(24-d[j])
    a=10000
    for p in range(1,1+n):
        for q in range(p):
            b=abs(t[p]-t[q])
            a=min(a,min(b,24-b))
    ans=max(ans,a)
print(ans)


### FIXED CODE ###

n=int(input())
d=list(map(int,input().split()))
if n>=24:
    print(0)
    exit()
if n>=22:
    t=[]
    d.append(0)
    d.sort()
    f=1
    for i in range(n):
        if d[i]==d[i+1]:
            f+=1
        else:
            if f>2:
                print(0)
                exit()
            f=1
    print(1)
    exit()

op=2**n-1
ans=0
for i in range(op):
    t=[0]
    for j in range(n):
        if i&(2**j)>0:
            t.append(d[j])
        else:
            t.append(24-d[j])
    a=10000
    for p in range(1,1+n):
        for q in range(p):
            b=abs(t[p]-t[q])
            a=min(a,min(b,24-b))
    ans=max(ans,a)
print(ans)
### BUGGY CODE ###

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


def check(a_list :list, X :int) -> int:
    count=0
    for num in a_list:
        diff = num - X
        if abs(diff) <=1:
            count += 1
    
    return count
   
#----------
N = int(input().strip())
a_list = list(map(int, input().rstrip().split()))
#----------
a_max=max(a_list)
a_min=min(a_list)

count = 0
for X in range( a_min, (a_max+1) ):
    tmp_count=check(a_list,X)
    
    if tmp_count > count:
        count = tmp_count
        #result_X = X
    
print(count)


### FIXED CODE ###

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


N = int(input().strip())
a_list = list(map(int, input().rstrip().split()))
#----------
a_set=set(a_list)
count_dic={}
for X in a_set:
    count_dic[str(X)] = 0
    count_dic[str(X+1)] = 0
    count_dic[str(X-1)] = 0

count = 0
for X in a_list:
    count_dic[str(X)] += 1
    count_dic[str(X+1)] += 1
    count_dic[str(X-1)] += 1
    
print(max(count_dic.values()))
### BUGGY CODE ###

def clear_maze(sx, sy, gx, gy, maze):
    INF = 100000000
    distance = [[INF for i in range(W)] for j in range(H)]
    def bfs():
        queue = []
        queue.insert(0, (sx, sy))
        distance[sy][sx] = 0
        while len(queue):
            x, y = queue.pop()
            if x == gx and y == gy:
                break
            for i in range(0, 4):
                nx, ny = x + [1, 0, -1, 0][i], y + [0, 1, 0, -1][i]
                if (0 <= nx and nx < W and 0 <= ny and ny < H and maze[ny][nx] != '#' and distance[ny][nx] == INF):
                    queue.insert(0, (nx, ny))
                    distance[ny][nx] = distance[y][x] + 1
        return distance[gy][gx]
    return bfs()

H,W = (int(x) for x in input().split())
maze = ['']*H
max_distance = 0
for i in range(H):
  maze[i] = list(input())
  
dic = {}
for i in range(H*W):
  dic[i] = [i % W,i//W,0]
  
for i in range(H*W):
  sx,sy = dic[i][0],dic[i][1]
  s = maze[sy][sx]
  if s == '#':
    continue
  for j in range(H*W):
    gx,gy = dic[j][0],dic[j][1]
    g = maze[gy][gx]
    if i == j or g == '#' or dic[j][2] == 1:
        continue
    tmp_s = s
    tmp_g = g
    maze[sy][sx] = 'S'
    maze[gy][gx] = 'G'
    max_distance = max(max_distance,clear_maze(sx, sy, gx, gy, maze))
    maze[sy][sx] = tmp_s
    maze[gy][gx] = tmp_g
  dic[i][2] = 1
        
print(max_distance)
    

    

### FIXED CODE ###

from collections import deque
import math
import copy
H,W = map(int,input().split())
maze = [list(input()) for _ in range(H)]
def bfs(maze,h,w,sx,sy):
    for y in range(h):
        for x in range(w):
            if maze[y][x]=='.':
                maze[y][x]=float('inf')

    maze[sy][sx]=0
    que=deque([[sy,sx]])
    while que:
        y,x=que.popleft()
        for i,j in [(1,0),(0,1),(-1,0),(0,-1)]:
            if 0 <= y+i < H and 0<=x+j<W:
                nexty,nextx=y+i,x+j
                dist=maze[nexty][nextx]
                if dist!='#':
                    if dist>maze[y][x]+1:
                        maze[nexty][nextx]=maze[y][x]+1
                        que.append([nexty,nextx])
    m = 0                   
    for l in maze:
      li = [i for i in l if i != '#' and i < 1000000]
      if len(li) > 0:
        m = max(m,max(li))
    return m
max_dist = -1  
for si in range(H):
  for sj in range(W):
    if maze[si][sj] == '#':
      continue
    copymaze = copy.deepcopy(maze)
    res = bfs(copymaze,H,W,sj,si)
    max_dist = max(max_dist,res)
print(max_dist)
### BUGGY CODE ###

from operator import mul
from functools import reduce

import copy
def combinations(n, r):
    r = min(r, n - r)
    numer = reduce(mul, range(n, n - r, -1), 1)
    denom = reduce(mul, range(1, r + 1), 1)
    return numer // denom

def main():
    N = int(input())
    AList = list(map(int, input().split()))

    SortList = copy.copy(AList)
    SortList.sort()

    NumberList = []
    CountList = []
    tmp = SortList[0]
    count = 0
    for i in SortList:
        if tmp == i:
            count += 1
        else:
            NumberList.append(tmp)
            CountList.append(count)
            tmp = i
            count = 1
    NumberList.append(tmp)
    CountList.append(count)

    CountListCopy = copy.copy(CountList)

    result = 0
    for i in range(0, len(AList)):
        CountListCopy[NumberList.index(AList[i])] -= 1
        for q in CountListCopy:
            if q < 2:
                continue
            else:
                result += combinations(q, 2)
        print(result)
        result = 0
    
        CountListCopy = copy.copy(CountList)
    
if __name__ == '__main__':
    main()

### FIXED CODE ###

from operator import mul
from functools import reduce
import collections
import sys
input = sys.stdin.readline
 
def combinations(n, r):
    r = min(r, n - r)
    numer = reduce(mul, range(n, n - r, -1), 1)
    denom = reduce(mul, range(1, r + 1), 1)
    return numer // denom
 
N = int(input())
 
AList = list(map(int, input().split()))

NumberList = set(AList)
CountList = collections.Counter(AList)

result = 0
for i in NumberList:
    if CountList[i] >= 2:
        result += combinations(CountList[i], 2)


for i in AList:
    print(result - (CountList[i] - 1))
### BUGGY CODE ###

#4回目、2020-0609 BSFやりかけたが・・・
#幅優先探索
def bfs(u):
    dist ={i:None for i in range(1,N+1)}
    dist[u] =0   
    dq =deque()
    dq.append(u)
    passed =set([u])
    #for i in range(1,N+1): #全頂点を始点としてBSFで距離
     #   dq.append(i)
    while dq:
        now =dq.popleft()
        for next in connection[now]:
            if next not in passed:
                dist[next] =dist[now] +1
                dq.append(next)
                passed.add(next)
    return dist

#初期入力
from collections import deque 
N, x, y = map(int, input().split())

# 構造
connection ={i:set() for i in range(1,N+1)}
for i in range(1,N):
    connection[i  ].add(i+1)
    connection[i+1].add(i)
connection[x].add(y)
connection[y].add(x)

#始点からの距離をBFS
#ans ={(i,j):[] for i in range(1,N+1) for j in range(1,N+1)}
ans ={(i):[] for i in range(0,N) }
for i in range(1,N+1): # i=始点
    d=bfs(i)
    for j,v in d.items(): #j=各頂点、v=始点から各頂点の距離
        if i <j:
            ans[v].append((i,j)) 
        #ans[i,j].append(v) 
for i in range(1,N):        
    print(len(ans[i]))

### FIXED CODE ###

N, X, Y = map(int, input().split())
D = [None] + [0] * (N - 1) #最低距離が1からNまでの個数を表示するリストを作る(YZT さんのコメント)

#各最低距離の個数カウント
for i in range(1, N):                           # i 出発
    for j in range(i + 1, N + 1):               # j 到着
        d = min(abs(j - i),                     # 近道をしない
                abs(X - i) + 1 + abs(j - Y),    # 「+1」は近道の距離、X < Y　
                abs(Y - i) + 1 + abs(j - X))    # 「+1」は近道の距離、Y < X　
        D[d] += 1                               # 距離ｄごとにカウント
        # print(abs(j-i),abs(X-i)+1 , abs(j-Y) , abs(Y - i) + 1,abs(j - X)," ",d,D," ",i,j)
    
for d in D[1:]: #最低距離は１だから距離０は使わないが、添え字＝距離とすることでわかりやすい
    print(d)
### BUGGY CODE ###

class BinaryIndexedTree():
  def __init__(self,n):self.bit=[0]*n
  def add(self,i,x):
    i+=1
    while i<=len(self.bit):
      self.bit[i-1]+=x
      i+=i&-i
  def sum_1(self,i):
    a=0
    i+=1
    while i:
      a+=self.bit[i-1]
      i-=i&-i
    return a
  def sum(self,i,j):
    a=self.sum_1(j-1)
    if i!=0:a-=self.sum_1(i-1)
    return a
def tentousu(a):
  bit=BinaryIndexedTree(n)
  b=[0]*n
  for i in range(n):
    b[a[i]]=i
  ans=0
  for i in range(n):
    j=b[i]+bit.sum(b[i]+1,n)
    ans+=j-i
    bit.add(b[i],1)
  return ans
n=int(input())
a=list(map(int,input().split()))
b=list(map(int,input().split()))
for i in range(1,n,2):a[i],b[i]=b[i],a[i]
ans=inf=float('inf')
for i in range(2**n):
  s=bin(i)[2:].zfill(n)
  if s.count("0")!=n//2:continue
  ac=[]
  bc=[]
  for j in range(n):
    if s[j]=="1":ac.append((a[j],j))
    else:bc.append((b[j],j))
  ac.sort()
  bc.sort()
  x=[]
  for j in range(n):
    if j%2:x.append(bc[j//2])
    else:x.append(ac[j//2])
  f=False
  for j in range(1,n):
    if x[j-1][0]>x[j][0]:f=True
  if f:continue
  m=[]
  for j in range(n):m.append(x[j][1])
  ans=min(ans,tentousu(m))
if ans==inf:ans=-1
print(ans)

### FIXED CODE ###

class BinaryIndexedTree():
  def __init__(self,n):self.bit=[0]*n
  def add(self,i,x):
    i+=1
    while i<=len(self.bit):
      self.bit[i-1]+=x
      i+=i&-i
  def sum_1(self,i):
    a=0
    i+=1
    while i:
      a+=self.bit[i-1]
      i-=i&-i
    return a
  def sum(self,i,j):
    a=self.sum_1(j-1)
    if i!=0:a-=self.sum_1(i-1)
    return a
def tentousu(a):
  bit=BinaryIndexedTree(n)
  b=[0]*n
  for i in range(n):
    b[a[i]]=i
  ans=0
  for i in range(n):
    j=b[i]+bit.sum(b[i]+1,n)
    ans+=j-i
    bit.add(b[i],1)
  return ans
n=int(input())
a=list(map(int,input().split()))
b=list(map(int,input().split()))
for i in range(1,n,2):a[i],b[i]=b[i],a[i]
ans=inf=float('inf')
for i in range(2**n):
  s=bin(i)[2:].zfill(n)
  if s.count("0")!=n//2:continue
  ac=[]
  bc=[]
  for j in range(n):
    if s[j]=="1":ac.append((a[j],j))
    else:bc.append((b[j],j))
  ac.sort()
  bc.sort()
  x=[]
  for j in range(n):
    if j%2:x.append(bc[j//2])
    else:x.append(ac[j//2])
  f=False
  for j in range(1,n):
    if x[j-1][0]>x[j][0]:f=True
  if f:continue
  m=[]
  for j in range(n):m.append(x[j][1])
  ans=min(ans,tentousu(m))
if ans==inf:ans=-1
print(ans)
### BUGGY CODE ###

from itertools import permutations
def warshall_floyd(n,e):
  INF=float("inf")
  g=[[INF]*n for _ in range(n)]
  for i in range(n):g[i][i]=0
  for a,b,c in e:g[a][b],g[b][a]=c,c
  for k in range(n):
    for i in range(n):
      for j in range(n):g[i][j]=min(g[i][k]+g[k][j],g[i][j])
  return g
n,m,rl=map(int,input().split());r,e=list(map(lambda x:int(x)-1,input().split())),[]
for i in range(m):x,y,z=map(int,input().split());e.append([x-1,y-1,z])
d=warshall_floyd(n,e)
a=float("inf")
for i in permutations(range(rl)):
  aa=0
  for x,y in zip(i,i[1:]):aa+=d[r[x]][r[y]]
  a=min(a,aa)
print(a)

### FIXED CODE ###

from itertools import permutations
n,m,rl=map(int,input().split());r=list(map(int,input().split()))
d=[[float("inf")for _ in range(n)]for _ in range(n)]
for i in range(m):
  x,y,z=map(int,input().split())
  d[x-1][y-1],d[y-1][x-1]=z,z
for i in range(n):d[i][i]=0
for k in range(n):
  for i in range(n):
    for j in range(n):d[i][j]=min(d[i][j],d[i][k]+d[k][j])
a=float("inf")
for i in permutations(r,rl):
  aa=0
  for j in range(rl-1):aa+=d[i[j]-1][i[j+1]-1]
  a=min(a,aa)
print(a)
### BUGGY CODE ###

import math,itertools,fractions,heapq,bisect,sys,copy,collections

sys.setrecursionlimit(10**7)
inf=10**20
mod=10**9+7
dd=[(-1,0),(0,1),(1,0),(0,-1)]
ddn=[(-1,0),(-1,1),(0,1),(1,1),(1,0),(1,-1),(0,-1),(-1,-1)]

def LI(): return [int(x) for x in sys.stdin.readline().split()]
def I(): return int(sys.stdin.readline())
def LS(): return sys.stdin.readline().split()
def S(): return input()

def main():
  h,w=LI()
  field=[S() for _ in range(h)]

  ans=0
  visited=[[-1 for __ in range(w)] for _ in range(h)]
  for i in range(h):
    for j in range(w):
      for k in range(h):
        for l in range(w):
          q=collections.deque()
          if field[i][j]=='#' or field[k][l]=='#':
            continue
          q.append((k,l,0))
          for _i in range(h):
            for _j in range(w):
              visited[_i][_j]=-1
          while len(q)>0:
            y,x,c=q.popleft()
            visited[y][x]=c
            if y==i and x==j:
              ans=max(ans,c)
              break

            for dy,dx in ((-1,0),(0,1),(1,0),(0,-1)):
              ny=y+dy
              nx=x+dx
              if 0<=ny<h and 0<=nx<w:
                if field[ny][nx]=='#':
                  continue
                if visited[ny][nx]!=-1:
                  continue
                q.append((ny,nx,c+1))

  return ans

# main()
print(main())


### FIXED CODE ###

import sys,collections

sys.setrecursionlimit(10**7)
inf=10**20
mod=10**9+7
dd=[(-1,0),(0,1),(1,0),(0,-1)]
ddn=[(-1,0),(-1,1),(0,1),(1,1),(1,0),(1,-1),(0,-1),(-1,-1)]

def LI(): return [int(x) for x in sys.stdin.readline().split()]
def I(): return int(sys.stdin.readline())
def LS(): return sys.stdin.readline().split()
def S(): return input()

def main():
  h,w=LI()
  field=[S() for _ in range(h)]

  ans=0
  visited=[[-1 for __ in range(w)] for _ in range(h)]
  q=collections.deque()
  for i in range(h):
    for j in range(w):
      if field[i][j]=='#':
        continue
      q.append((i,j))
      for _i in range(h):
        for _j in range(w):
          visited[_i][_j]=-1
      visited[i][j]=0
      _ans=0
      while q:
        y,x=q.popleft()

        for dy,dx in ((-1,0),(0,1),(1,0),(0,-1)):
          ny=y+dy
          nx=x+dx
          if not 0<=ny<h:
            continue
          if not 0<=nx<w:
            continue
          if field[ny][nx]=='#':
            continue
          if visited[ny][nx]!=-1:
            continue
          _ans=visited[y][x]+1
          visited[ny][nx]=_ans
          q.append((ny,nx))
      ans=max(ans,_ans)
  return ans

# main()
print(main())
### BUGGY CODE ###


import numpy as np
def receive_round_setting():
    round_settings = input()
    N, K, Q = round_settings.split(' ')
    N, K, Q = int(N), int(K), int(Q)
    participants = np.full(N, K, dtype='i')
    round_settings = {'N':N, 'K':K, 'Q':Q,
                    'participants':participants}
    return round_settings

def answer_question(round_settings):
    for i in range(round_settings['Q']):
        answerer = int(input()) - 1
        round_settings['participants'] -= 1
        round_settings['participants'][answerer] += 1
    return round_settings
        
def announce_resutl(round_setting):

    [print('Yes') if participant > 0 else print('No')
    for participant in round_settings['participants']]

if __name__ == '__main__':
    round_settings = receive_round_setting()
    if round_settings['Q'] < round_settings['K']:
        announce_resutl(round_settings)
    else:
        round_settings = answer_question(round_settings)
        announce_resutl(round_settings)
    # round_settings = receive_round_setting()
    # round_settings = answer_question(round_settings)
    # announce_resutl(round_settings)


### FIXED CODE ###


import numpy as np
def receive_round_setting():
    round_settings = input()
    N, K, Q = round_settings.split(' ')
    N, K, Q = int(N), int(K), int(Q)
    participants = np.full(N, K, dtype='i')
    round_settings = {'N':N, 'K':K, 'Q':Q,
                    'participants':participants}
    return round_settings

def answer_question(round_settings):
    round_settings['participants'] -= 1*round_settings['Q']
    answerers = np.zeros(shape=round_settings['N'], dtype='i')
    for _ in range(round_settings['Q']):
        answerer = int(input()) - 1
        answerers[answerer] += 1
    round_settings['participants'] += answerers
    return round_settings
        
def announce_resutl(round_setting):

    [print('Yes') if participant > 0 else print('No')
    for participant in round_settings['participants']]

if __name__ == '__main__':
    round_settings = receive_round_setting()
    if round_settings['Q'] < round_settings['K']:
        announce_resutl(round_settings)
    else:
        round_settings = answer_question(round_settings)
        announce_resutl(round_settings)
    # round_settings = receive_round_setting()
    # round_settings = answer_question(round_settings)
    # announce_resutl(round_settings)
### BUGGY CODE ###

# D - Multiple of 2019
S = input()
mod = [1]+[0]*2018
tmp = 0
for k in range(len(S)):
    tmp = (10**k*int(S[len(S)-1-k])+tmp)%2019
    mod[tmp] += 1
ans = 0
for k in range(2019):
    ans += mod[k]*(mod[k]-1)//2
print(ans)

### FIXED CODE ###

# D - Multiple of 2019
S = input()
mod = [1]+[0]*2018
tmp = 0
seki = 1
for k in range(len(S)):
    tmp = (seki*int(S[len(S)-1-k])+tmp)%2019
    mod[tmp] += 1
    seki = (seki*10)%2019
ans = 0
for k in range(2019):
    ans += mod[k]*(mod[k]-1)//2
print(ans)
### BUGGY CODE ###

#数字はnumberに格納
number=input()
length=len(number)


#調整のための数字
sizemin=1000000007

#まずはからのDPリストを用意
dp=[[0 for i in range(13)] for j in range(length)]

#1桁目の情報を入力
if number[-1]=="?":
    for i in range(10):
        dp[0][i]=1
else:
    dp[0][int(number[-1])]=1

#１０〜９０の、13modリストを作る
modlist=[(i*10)%13 for i in range(10)]


        
#二桁目からの情報を更新していく。
for n in range(length-1):
    #n桁目の情報があれば、次のようにn+1行目を更新。

    #n+1のくらいの数をchecknumとする
    checknum=number[-1*(n+1)-1]
#     print(checknum)

    #n+1の位が整数であれば
    if checknum!="?":
        
        #n[m]の値をn+1[m+(その整数)]にすればいい
        for m in range(13):
            dp[n+1][(m+modlist[int(checknum)])%13]=dp[n][m]
#         print(dp)
        
        
        
        
        
    #n+1のくらいが？の時
    else:
    #？が０〜９までの可能性を全て試す  
    
        for checknum in range(10):
            for m in range(13):
                dp[n+1][(m+modlist[int(checknum)])%13]=(dp[n+1][(m+modlist[int(checknum)])%13]+dp[n][m])%sizemin
#             print(dp)

    #modlistを更新
    modlist=[(j*10)%13 for j in modlist]


print(dp[-1][5])

### FIXED CODE ###

#数字はnumberに格納
number=input()
length=len(number)


#調整のための数字
sizemin=1000000007

#まずはからのDPリストを用意
dp=[[0 for i in range(13)] for j in range(length)]

#1桁目の情報を入力
if number[-1]=="?":
    for i in range(10):
        dp[0][i]=1
else:
    dp[0][int(number[-1])]=1

#１０〜９０の、13modリストを作る
modlist=[(i*10)%13 for i in range(10)]


        
#二桁目からの情報を更新していく。
for n in range(length-1):
    #n桁目の情報があれば、次のようにn+1行目を更新。

    #n+1のくらいの数をchecknumとする
    checknum=number[-1*(n+1)-1]
#     print(checknum)

    #n+1の位が整数であれば
    if checknum!="?":
        
        #n[m]の値をn+1[m+(その整数)]にすればいい
        for m in range(13):
            dp[n+1][(m+modlist[int(checknum)])%13]=dp[n][m]
#         print(dp)
        
        
        
        
        
    #n+1のくらいが？の時
    else:
    #？が０〜９までの可能性を全て試す  
    
        for checknum in range(10):
            for m in range(13):
                dp[n+1][(m+modlist[int(checknum)])%13]=(dp[n+1][(m+modlist[int(checknum)])%13]+dp[n][m])%sizemin
#             print(dp)

    #modlistを更新
    modlist=[(j*10)%13 for j in modlist]


print(dp[-1][5])
### BUGGY CODE ###

n,m = map(int, input().split())
py = []
for i in range(m):
    py.append(list(map(int, input().split())))
check = [[] for i in range(n)]
for i in py:
    check[i[0]-1].append(i[1])
for i in range(len(check)):
    check[i] = sorted(check[i])
for i in py:
    x = (check[i[0]-1].index(i[1]) + 1)
    ans = str(i[0]).zfill(6) + str(x).zfill(6)
    print(ans)

### FIXED CODE ###

n, m = map(int, input().split())
D = [[] for _ in range(n)]
for i in range(m):
    p,y = map(int, input().split())
    D[p-1].append((y,i))
ans = [None] * m
for i,d in enumerate(D):
    d.sort()
    for j, (k,l) in enumerate(d):
        ans[l] = str(i+1).zfill(6) + str(j+1).zfill(6)
for i in ans:
    print(i)
### BUGGY CODE ###

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

if A > K:
    a = K
else:
    a = A
    
if (A + B) < K:
    for i in range(0,K-A-B):
        a = a - 1
print(a)

### FIXED CODE ###

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

if A > K:
    a = K
else:
    a = A
    
if (A + B) < K:
    a = a - K + A + B
print(a)
### BUGGY CODE ###

import string

N = int(input())
groups = {0: 1}
groups_sorted = {0: sorted(input())}

count = 0

for i in range(1,N):
  s = sorted(input())
  
  add_grouped = False
  
  for key,s_check in groups_sorted.items():
    if s == s_check:
      count += groups[key]
      groups[key]+=1
      add_grouped = True
      break
      
  if not add_grouped:
    groups[len(groups.keys())] = 1
    groups_sorted[len(groups_sorted.keys())] = s
  
print(count)

### FIXED CODE ###

import string
import collections

N = int(input())
count = 0

s = []

for i in range(0,N):
  s.append(''.join(sorted(input())))

  
c = collections.Counter(s)
go = c.most_common()

for i in range(len(go)):
  k = go[i][1]
  count+=k*(k-1)//2
  
print(count)