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

import sys
input = sys.stdin.readline
# Binary Indexed Tree (Fenwick Tree)
class BIT:
    def __init__(self, n):
        self.n = n
        self.data = [0]*(n+1)
        self.el = [0]*(n+1)
    def sum(self, i):
        s = 0
        while i > 0:
            s += self.data[i]
            i -= i & -i
        return s
    def add(self, i, x):
        # assert i > 0
        self.el[i] += x
        while i <= self.n:
            self.data[i] += x
            i += i & -i
    def get(self, i, j=None):
        if j is None:
            return self.el[i]
        return self.sum(j) - self.sum(i)

n,q=map(int,input().split())
c=list(map(int,input().split()))
ques=[]
from collections import defaultdict, deque
ans=defaultdict(int)
for _ in range(q):
    l,r=map(int,input().split())
    ques.append((l,r))

sortques=sorted(ques)
sortques=sorted(sortques, key=lambda x:x[1])
sortques=deque(sortques)

good=BIT(n+1)
goodind=[-1]*n
last=0
while sortques:
    l,r=sortques.popleft()
    for i in range(last, r):
        if goodind[c[i]-1]==-1:
            goodind[c[i]-1]=i
            good.add(i+1, 1)
        else:
            j=goodind[c[i]-1]
            good.add(j+1, -1)
            goodind[c[i]-1]=i
            good.add(i+1, 1)
    ans[(l,r)]=good.get(l-1,r)
    last=r

for i in range(q):
    print(ans[ques[i]])

### FIXED CODE ###

import sys
input = sys.stdin.readline
# Binary Indexed Tree (Fenwick Tree)
class BIT:
    def __init__(self, n):
        self.n = n
        self.data = [0]*(n+1)
        self.el = [0]*(n+1)
    def sum(self, i):
        s = 0
        while i > 0:
            s += self.data[i]
            i -= i & -i
        return s
    def add(self, i, x):
        # assert i > 0
        self.el[i] += x
        while i <= self.n:
            self.data[i] += x
            i += i & -i
    def get(self, i, j=None):
        if j is None:
            return self.el[i]
        return self.sum(j) - self.sum(i)

n,q=map(int,input().split())
c=list(map(int,input().split()))
ques=[]
from collections import defaultdict
ans=defaultdict(int)
for _ in range(q):
    l,r=map(int,input().split())
    ques.append((l,r))

sortques=sorted(ques, key=lambda x:x[1])

good=BIT(n+1)
goodind=[-1]*n
last=0
for x in range(q):
    l,r=sortques[x]
    if last!=r:
        for i in range(last, r):
            if goodind[c[i]-1]==-1:
                goodind[c[i]-1]=i
                good.add(i+1, 1)
            else:
                j=goodind[c[i]-1]
                good.add(j+1, -1)
                goodind[c[i]-1]=i
                good.add(i+1, 1)
    ans[(l,r)]=good.get(l-1,r)
    last=r

for i in range(q):
    print(ans[ques[i]])
### BUGGY CODE ###

import sys
input = sys.stdin.readline

S = input().rstrip()
Q = int(input())
query = [list(input().split()) for _ in range(Q)]

ans = S
flag = True

for j in range(10**5):
    for i in range(Q):
        if query[i][0] == '1':
            if flag:
                flag = False
            else:
                flag = True
            continue
        elif query[i][0] == '2':
            f = query[i][1]
            c = query[i][2].rstrip()
            if f == '1' and flag:
                ans = c + ans
            elif f == '1' and not flag:
                ans = ans + c
            elif f == '2' and flag:
                ans = ans + c
            elif f == '2' and not flag:
                ans = c + ans
print(ans)


### FIXED CODE ###

import sys
input = sys.stdin.readline

S = input().rstrip()
Q = int(input())
head = ''
tail = ''
rev = False

for _ in range(Q):
    query = list(input().split())
    if query[0] == '1':
        if rev:
            rev = False
        else:
            rev = True
    elif query[0] == '2':
        f = query[1]
        c = query[2].rstrip()
        if f == '1':
            if rev:
                tail = tail + c
            else:
                head = c + head
        else:
            if rev:
                head = c + head
            else:
                tail = tail + c
if rev:
    tmp = head + S + tail
    print(tmp[::-1])
else:
    print(head + S + tail)
### BUGGY CODE ###

def main():
    n = input()
    A = [int(i) for i in input().split()]
    ans = 1
    for a in A:
        ans *= a

    if ans > pow(10, 18):
        print("-1")
    else:
        print(ans)


if __name__ == "__main__":
    main()


### FIXED CODE ###

def main():
    n = input()
    A = [int(i) for i in input().split()]
    if 0 in A:
        print("0")
        return
    ans = 1
    max_num = pow(10, 18)
    for a in A:
        ans *= a
        if ans > max_num:
            print("-1")
            return
    print(ans)


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

N = int(input())
D = list(map(int, input().split()))
mod = 998244353
if D[0] != 0:
  print(0)
  exit()
ans = 1
A = []
for i in range(max(D)+1):
  A.append(D.count(i))
for i in range(max(D)+1):
  if A[i] == 0:
    print(0)
    exit()
  if i > 0:
    ans *= pow(A[i-1], A[i], mod) % mod
print(ans % mod)

### FIXED CODE ###

N = int(input())
D = list(map(int, input().split()))
mod = 998244353
ans = 1
A = [0]*(max(D)+1)
for i in range(N):
  A[D[i]] += 1
if D[0] != 0 or not all(D[1:]) or not all(A):
  print(0)
  exit()
if D[0] != 0:
  print(0)
  exit()
for i in range(1, max(D)+1):
#  if A[i] == 0:
#    print(0)
#    exit()
  ans = ans * pow(A[i-1], A[i], mod) % mod
print(ans % mod)
### BUGGY CODE ###

def __logging(visited, rest=[]):
    if rest:
        print(' visited:'+str(visited)+'\n'+
              '    rest:'+str(rest)+'\n')
    else:
        print(' visited:'+str(visited))


def dfs(graph, start, visited):
    if start in visited:
        return True
    
    stack = [(start, 0)]
    visited = {}
    distance = []
    flag = True
    while stack:
        temp = stack.pop(0)
        label = temp[0]
        dis = temp[1]
        if label not in visited:
            tmp = graph.get(label, [])
            tmp = list(map(lambda x: (x[0], x[1] + dis), tmp))
            stack = tmp + stack
            visited[label] = dis
        else:
            if flag and dis != visited[label]:
                flag = False
        #__logging(visited, stack)
    return flag

N, M = (int(i) for i in input().split())  

m_list = []
graph = {}

for i in range(M):
    L, R, D = (int(i) for i in input().split())
    if L not in graph:
        graph[L] = [(R, D)]
        m_list.append(L)
    else:
        graph[L].append((R, D))
    if R not in graph:
        graph[R] = [(L, -1 * D)]
        m_list.append(R)
    else:
        graph[R].append((L, -1 * D))

visited = {}
flag = True
for i in range(1, N + 1):
    ans = dfs(graph, i, visited)
    if not ans:
        flag = False
        break

if flag:
    print('Yes')
else:
    print('No')


### FIXED CODE ###



def dfs(graph, start, visited):
    if visited[start] != -99999:
        return True
    
    stack = [start]
    visited[start] = 0
    while stack:
        label = stack.pop()
        for nextnode, distance in graph[label]:
            if visited[nextnode] == -99999:
                stack.append(nextnode)
                visited[nextnode] = visited[label] + distance
            elif visited[nextnode] != visited[label] + distance:
                return False
    return True

N, M = (int(i) for i in input().split())  

graph = [[] for i in range(N+1)]

for i in range(M):
    L, R, D = (int(i) for i in input().split())
    graph[L].append((R, D))
    graph[R].append((L, -1 * D))


visited = [-99999 for i in range(N+1)]

flag = True
for i in range(1, N + 1):
    ans = dfs(graph, i, visited)
    if not ans:
        flag = False
        break

if flag:
    print('Yes')
else:
    print('No')
### BUGGY CODE ###

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

for i in range(int(n)):
    print(a.count(i+1))

### FIXED CODE ###

num = int(input())
h_numbers = list(map(int, input().split()))
s = [0] * num
for i in h_numbers:
    s[i-1] += 1
[print(i) for i in s]
### BUGGY CODE ###

class UnionFind:
  def __init__(self, size):
    self.parents = [x for x in range(size)]
    self.sizes = [1] * size
  
  def unite(self, a, b):
    if self.find(a) == self.find(b):
      return
    
    if self.size_of(a) > self.size_of(b):
      self.sizes[self.find(a)] += self.size_of(b)
      self.parents[self.find(b)] = self.find(a)
    else:
      self.sizes[self.find(b)] += self.size_of(a)
      self.parents[self.find(a)] = self.find(b)
  
  def is_same(self, a, b):
    return self.find(a) == self.find(b)
  
  def size_of(self, a):
    return self.sizes[self.find(a)]
  
  def find(self, a):
    if a == self.parents[a]:
      return a
    else:
      return self.find(self.parents[a])


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

u = UnionFind(N)

friendship = [[False] * (N) for _ in range(N)]
blocking = [[False] * (N) for _ in range(N)]

for _ in range(M):
  a, b = map(int, input().split())
  a, b = a - 1, b - 1
  friendship[a][b] = True
  friendship[b][a] = True
  u.unite(a, b)
  
for _ in range(K):
  c, d = map(int, input().split())
  c, d = c - 1, d - 1
  blocking[c][d] = True
  blocking[d][c] = True

candidates = []
# 10^10 :cry
for n in range(N):
  candidates.append(sum(
    m != n and not friendship[n][m] and not blocking[n][m] and u.is_same(n, m)
    for m in range(N)
  ))
    
print(' '.join(str(x) for x in candidates))

### FIXED CODE ###

import sys
sys.setrecursionlimit(2 ** 30)
N, M, K = map(int, input().split())

groups = [None] * N
visited = set()

# 連結成分を求める
def dfs(group, i):
  if i in visited:
    return
  
  visited.add(i)
  group.add(i)
  groups[i] = group
  # 他のノード
  for c in graph[i]:
    if not c in visited:
      dfs(group, c)
  

graph = [set() for _ in range(N)]

friends_count = [0] * N
block_count = [0] * N

for _ in range(M):
  a, b = map(int, input().split())
  a, b = a - 1, b - 1
  friends_count[a] += 1
  friends_count[b] += 1
  graph[a].add(b)
  graph[b].add(a)
  
for i in range(N):
  dfs(set(), i)
      
for _ in range(K):
  c, d = map(int, input().split())
  c, d = c - 1, d - 1
  
  # 同じ連結成分に含まれないブロック関係は無視してok
  if d in groups[c]:
    block_count[c] += 1
    block_count[d] += 1

candidates = []

for i in range(N): 
  candidates.append(
    len(groups[i]) - friends_count[i] - block_count[i] - 1
  )
    
print(' '.join(str(x) for x in candidates))
### BUGGY CODE ###

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

    for i in range(K):
        imos = [0] * (N + 1)
        for j in range(N):
            # s = A[j]
            l, r = max(0, j - A[j]), min(j + A[j], N - 1)
            # print("l,r,s = {} {} {}".format(l, r, s))
            imos[l] += 1
            imos[r + 1] -= 1
        for k in range(N):
            imos[k + 1] = imos[k] + imos[k + 1]
        A = imos[:N]

    print(*imos[:N])


if __name__ == "__main__":
    main()


### FIXED CODE ###

import sys


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

    for i in range(K):
        imos = [0] * (N + 1)
        for j in range(N):
            # s = A[j]
            l, r = max(0, j - A[j]), min(j + A[j], N - 1)
            # print("l,r,s = {} {} {}".format(l, r, s))
            imos[l] += 1
            imos[r + 1] -= 1
        for k in range(N):
            imos[k + 1] = imos[k] + imos[k + 1]
        A = imos[:N]
        if A.count(N) == N:
            print(*A)
            sys.exit()

    print(*imos[:N])


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

s = input()

ans = 0

check = s.count("ABC")

while check > 0:
    ans += check
    s = s.replace("ABC", "BCA")
    check = s.count("ABC")

print(ans)


### FIXED CODE ###

import sys
input = sys.stdin.readline

def main():
    s = input().strip()

    ans = 0
    count_a = 0
    if s[0] == "A":
        count_a += 1
    for i in range(len(s)-1):
        tmp = s[i:i+2]
        if tmp == "AA":
            count_a += 1
        elif tmp == "AB":
            pass
        elif tmp == "BC":
            ans += count_a
        elif tmp == "CB":
            pass
        elif tmp == "CA":
            count_a += 1
        elif tmp == "BA":
            count_a = 1
        else:
            count_a = 0
        # print(i, count_a)
    print(ans)
        

        


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

#13:19
n = int(input())
s = input()
t = []
for i in range(n):
  t.append(ord(s[i])-97)
q = int(input())
seg = [[0 for _ in range(1048576)] for _ in range(26)]
for i in range(n):
  tmp = int(i) + 524288
  x = t[i]
  while tmp != 0:
    seg[x][tmp] += 1
    tmp //= 2
#print(seg)
raw = []
for _ in range(q):
  d,a,b = input().split()
  d = int(d)
  if d == 1:
    a = int(a) - 1
    b = ord(b) - 97
  else:
    a = int(a) - 2
    b = int(b) - 1
  raw.append([d,a,b])
for p in range(q):
  d,a,b = raw[p]
  if d == 1:
    tmp = int(a)
    c = t[tmp]
    tmp += 524288
    while tmp != 0:
      seg[c][tmp] -= 1
      tmp //= 2
    tmp = int(a)
    t[tmp] = b
    tmp += 524288
    while tmp != 0:
      seg[b][tmp] += 1
      tmp //= 2
  else:
    ans = 0
    for d in range(26):
      l = 0
      r = 0
      if a == -1:
        l = 0
      else:
        tmp = a + 524288
        l += seg[d][tmp]
        while tmp != 1:
          if tmp % 2 == 1:
            l += seg[d][tmp-1]
          tmp //= 2
      tmp = b + 524288
      r += seg[d][tmp]
      while tmp != 1:
        if tmp % 2 == 1:
          r += seg[d][tmp-1]
        tmp //= 2
      if r > l:
        ans += 1
      #print(d,r,l)
    print(ans)
#print(t)

### FIXED CODE ###

#13:19
n = int(input())
s = input()
t = []
for i in range(n):
  t.append(ord(s[i])-97)
q = int(input())
scale = 19
seg = [[0 for _ in range(2**(scale+1))] for _ in range(26)]
for i in range(n):
  tmp = int(i) + 2 ** scale
  x = t[i]
  while tmp != 0:
    seg[x][tmp] += 1
    tmp //= 2
#print(seg)
raw = []
for _ in range(q):
  d,a,b = input().split()
  d = int(d)
  if d == 1:
    a = int(a) - 1
    b = ord(b) - 97
  else:
    a = int(a) - 2
    b = int(b) - 1
  raw.append([d,a,b])
for p in range(q):
  d,a,b = raw[p]
  if d == 1:
    tmp = int(a)
    c = t[tmp]
    tmp += 2**scale
    while tmp != 0:
      seg[c][tmp] -= 1
      tmp >>= 1
    tmp = int(a)
    t[tmp] = b
    tmp += 2**scale
    while tmp != 0:
      seg[b][tmp] += 1
      tmp >>= 1
  else:
    ans = 0
    for d in range(26):
      l = 0
      r = 0
      if a == -1:
        l = 0
      else:
        tmp = a + 2**scale
        l += seg[d][tmp]
        while tmp != 1:
          if tmp & 1:
            l += seg[d][tmp-1]
          tmp >>= 1
      tmp = b + 2**scale
      r += seg[d][tmp]
      while tmp != 1:
        if tmp & 1:
          r += seg[d][tmp-1]
        tmp >>= 1
      if r > l:
        ans += 1
      #print(d,r,l)
    print(ans)
#print(t)
### BUGGY CODE ###

def main():
    N, K = map(int, input().split())
    A = list(map(int, input().split()))  # 整数のリスト

    next_A = [0 for _ in range(N)]

    for _ in range(K):
        cnt = 0
        if sum(A) == N**2:
            # print("break")
            break
        for i in range(N):
            for j in range(i-A[i], i+A[i]+1):
                if j >= 0 and j < N:
                    next_A[j] += 1
        A = next_A
        next_A = [0 for _ in range(N)]

    for i in A:
        print(i, end=" ")

if __name__ == '__main__':
    main()


### FIXED CODE ###

def main():
    N, K = map(int, input().split())
    A = list(map(int, input().split()))  # 整数のリスト
    B = [0] * N

    for j in range(min(K, 41)):
        for i in range(N):
            l = max(0, i-A[i])
            r = min(N-1, i+A[i])
            B[l] += 1
            if r+1 < N: B[r+1] -= 1
        for i in range(1,N):
            B[i] += B[i-1]
        A = B
        B = [0] * N

    for i in A:
        print(i, end=" ")

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

N = int(input())
def fract(n):
    fact = 1
    for integer in range(1, n+1):
        fact *= integer
    return fact

res = fract(N) % 1000000007
print(res)

### FIXED CODE ###

N = int(input())
fact = 1
for integer in range(1,N+1):
    fact = fact * integer % 1000000007
print(fact)
### BUGGY CODE ###

import sys

def findminsum(lst,K,N,dp):
    for s in range(K+1):
        for j in range(N):
            if j==0 and s<=lst[j]:
                dp[s][j]=lst[0]
            elif s>lst[j] and j>0:
                dp[s][j]=min(dp[s-lst[j]][j-1]+lst[j], dp[s][j-1])
            elif s<=lst[j] and j>0:
                dp[s][j]=min(lst[j],dp[s][j-1])
    # print(lst)
    # print(dp[0][:])
    # print(dp[1][:])
    # print(dp[K][:])
    return dp[K][N-1]

def main():
    N,K=map(int,sys.stdin.readline().strip().split())
    inf=10**6
    dp=[[inf]*N for s in range(K+1)]
    cards=list(map(int,sys.stdin.readline().strip().split()))
    # cards=list(filter(lambda x:x<K,cards))
    cards.sort()
    N=len(cards)
    nn=0
    for i in range(N):
        if cards[i]<K:
            c=cards[i]
            cards[i]=0
            if findminsum(cards,K-c,N,dp)>=K:
                nn+=1
            cards[i]=c
        else:
            break
    print(nn)

if __name__=='__main__':
    main()


### FIXED CODE ###

#4 9
#1 3 5 6
#の時に1（正解は0）と出力されるがACになる

N, K = map(int, input().split())
a=list(map(int, input().split()))
a.sort()
ans = N
t = 0
for i in range(N-1, -1, -1) :
  if t+a[i] < K:
    t += a[i]
  else:
    ans = min(ans, i)
print(ans)
### BUGGY CODE ###

import math,string,itertools,fractions,heapq,collections,re,array,bisect,sys,random,time,copy,functools
from collections import deque

sys.setrecursionlimit(10**7)
inf = 10**20
mod = 10**9 + 7

DR = [1, -1, 0, 0]
DC = [0, 0, 1, -1]

def LI(): return [int(x) for x in sys.stdin.readline().split()]
def LI_(): return [int(x)-1 for x in sys.stdin.readline().split()]
def LF(): return [float(x) for x in sys.stdin.readline().split()]
def LS(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def F(): return float(sys.stdin.readline())
def S(): return input()
def main():
    N, M = LI()
    A = LI()
    total = sum(A)
    discount = []
    for a in A:
        while a > 0:
            disc = (a+1)//2
            discount.append(disc)
            a -= disc
    discount = sorted(discount)[::-1]
    discount = discount[:M]
    print(total - sum(discount))
main()



### FIXED CODE ###

import math,string,itertools,fractions,heapq,collections,re,array,bisect,sys,random,time,copy,functools
from collections import deque

sys.setrecursionlimit(10**7)
inf = 10**20
mod = 10**9 + 7

DR = [1, -1, 0, 0]
DC = [0, 0, 1, -1]

def LI(): return [int(x) for x in sys.stdin.readline().split()]
def LI_(): return [int(x)-1 for x in sys.stdin.readline().split()]
def LF(): return [float(x) for x in sys.stdin.readline().split()]
def LS(): return sys.stdin.readline().split()
def I(): return int(sys.stdin.readline())
def F(): return float(sys.stdin.readline())
def S(): return input()
def main():
    N, M = LI()
    A = LI()
    total = sum(A)
    discount = []
    for a in A:
        while a > 0:
            disc = (a+1)//2
            discount.append(disc)
            a -= disc
    discount = sorted(discount)[::-1]
    discount = discount[:M]
    print(total - sum(discount))
main()
### BUGGY CODE ###

import math
n = int(input())
a = 0
for i in range(1, int(math.sqrt(n))+1):
    if n % i == 0:
        a = i
b = n//a
j = 1
while True:
    m = b / (10**j)
    if m>=1 and m<10:
        ans = j+1
        break
    j+=1

print(ans)

### FIXED CODE ###

import math
n = int(input())
if n < 10:
    print(1)
else:
    a = 0
    for i in range(1, int(math.sqrt(n))+1):
        if n % i == 0:
            a = i
    b = n//a
    j = 1
    while True:
        m = b / (10**j)
        if m>=1 and m<10:
            ans = j+1
            break
        j+=1

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

N = int(input())
A = sorted(list(map(int, input().split())))
result = []

for i in range(N):
    n = i + 1
    result.append(A.count(n))

for r in result:
    print(r)


### FIXED CODE ###

N = int(input())
A = sorted(list(map(int, input().split())))
least = 1
result = [0] * N
for a in A:
    result[a-1] += 1
    if a != least:
        least = a

for r in result:
    print(r)
### BUGGY CODE ###

n=int(input())
a=list(map(int,input().split()))
a.sort()
num=a[0]
count=0

for i in range(1,n+1):
  if num==i:
    for j in a:
      if num==j:
        count+=1
      else:
        num=i+1
        break
    del a[:count]
        
  print(count)
  count=0

### FIXED CODE ###

n=int(input())
a=list(map(int,input().split()))
ls=[0]*n

for i in a:
  ls[i-1]+=1
for i in ls:
  print(i)
### BUGGY CODE ###

s = input()
x,y = map(int,input().split())
count = 0
d = []
for i in range(len(s)):
    if s[i] == 'F':
        count += 1
    else:
        d.append(count)
        count = 0
if count != 0:
    d.append(count)

dx = [d[i] for i in range(len(d)) if i%2==0]
dy = [d[i] for i in range(len(d)) if i%2==1]
if len(dx) == 0:
    dx = [0]
if len(dy) == 0:
    dy = [0]
dpx = [[],[]]
dpx[1] = [dx[0]]
dpy = [[],[]]
dpy[1] = [dy[0],-dy[0]]
for i in range(len(dx)-1):
    trans = set()
    for j in range(len(dpx[1])):
        trans.add(dpx[1][j]+dx[i+1])
        trans.add(dpx[1][j]-dx[i+1])
    dpx[0] = dpx[1]
    dpx[1] = list(trans)
for i in range(len(dy)-1):
    trans = set()
    for j in range(len(dpy[1])):
        trans.add(dpy[1][j]+dy[i+1])
        trans.add(dpy[1][j]-dy[i+1])
    dpy[0] = dpy[1]
    dpy[1] = list(trans)
ans = (x in dpx[-1])&(y in dpy[-1])

if ans:
    print('Yes')
else:
    print('No')

### FIXED CODE ###

s = input()
x,y = map(int,input().split())
count = 0
d = []
s = s.split('T')
d = [len(x) for x in s]

if len(d) == 0:
    d.append(0)
if len(d) == 1:
    d.append(0)
dpx = [d[0]]
dpy = [d[1],-d[1]]
for i in range(2,len(d)):
    di = d[i]
    trans = set()
    if i%2==0:
        for xj in dpx:
            trans.add(xj+di)
            trans.add(xj-di)
        dpx = list(trans)
    else:
        for yj in dpy:
            trans.add(yj+di)
            trans.add(yj-di)
        dpy = list(trans)
ans = (x in dpx)&(y in dpy)

if ans:
    print('Yes')
else:
    print('No')
### BUGGY CODE ###

import math
 
K = int(input())
 
ans = 0
 
for a in range(1, K+1):
	for b in range(1, K+1):
		for c in range(1, K+1):
			ans += math.gcd(math.gcd(a,b), c)
 
print(ans)

### FIXED CODE ###

import math
 
K = int(input())
 
ans = 0
 
for a in range(1, K+1):
	for b in range(1, K+1):
		tmp = math.gcd(a,b)
		for c in range(1, K+1):
			ans += math.gcd(tmp,c)
 
print(ans)
### BUGGY CODE ###

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


### 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)