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

import sys
import heapq, math
from itertools import zip_longest, permutations, combinations, combinations_with_replacement
from itertools import accumulate, dropwhile, takewhile, groupby
from functools import lru_cache
from copy import deepcopy
from typing import List

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


def solve(N: int, K: int, P: List[int], C: List[int]):
    ans = max(C)
    visited = [False] * N
    for i in range(N):
        if visited[i]:
            continue

        cycle = []
        to = i
        while not visited[to]:
            visited[to] = True
            cycle.append(C[to])
            to = P[to] - 1

        ans = max(ans, partial_solve(len(cycle), K, cycle))

    return ans


def partial_solve(N: int, K: int, A: List[int]):
    ret = max(A)
    B = [0] * (3 * N + 1)
    for i in range(1, 3 * N + 1):
        B[i] = B[i - 1] + A[(i - 1) % N]

    if N > K:
        for l in range(1, N + 1):
            for r in range(l, l + K):
                ret = max(ret, B[r] - B[l - 1])

    else:
        if B[N] < 0:
            K = N
            for l in range(1, N + 1):
                for r in range(l, l + K):
                    ret = max(ret, B[r] - B[l - 1])
        else:
            cnt = K // N - 1

            K = K % N + N

            for l in range(1, N + 1):
                for r in range(l, l + K):
                    ret = max(ret, B[r] - B[l - 1])

            ret += cnt * B[N]

    return ret

print(solve(N, K, P, C))


### FIXED CODE ###

from typing import List

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


def solve(N: int, K: int, P: List[int], C: List[int]):
    ans = max(C)
    visited = [False] * N
    for i in range(N):
        if visited[i]:
            continue

        cycle = []
        to = i
        while not visited[to]:
            visited[to] = True
            cycle.append(C[to])
            to = P[to] - 1

        ans = max(ans, partial_solve(len(cycle), K, cycle))

    return ans


def partial_solve(N: int, K: int, A: List[int]):
    ret = max(A)
    B = [0] * (3 * N + 1)
    for i in range(1, 3 * N + 1):
        B[i] = B[i - 1] + A[(i - 1) % N]

    if N > K:
        for l in range(1, N + 1):
            for r in range(l, l + K):
                ret = max(ret, B[r] - B[l - 1])

    else:
        if B[N] < 0:
            K = N
            for l in range(1, N + 1):
                for r in range(l, l + K):
                    ret = max(ret, B[r] - B[l - 1])
        else:
            cnt = K // N - 1

            K = K % N + N

            for l in range(1, N + 1):
                for r in range(l, l + K):
                    ret = max(ret, B[r] - B[l - 1])

            ret += cnt * B[N]

    return ret

print(solve(N, K, P, C))
### BUGGY CODE ###

import sys
sys.setrecursionlimit(10**6)
edges = {}
p = {}
done_nodes = set()
def dfs(target_node, keisyo_point):
    global p
    done_nodes.add(target_node)
    p[target_node] += keisyo_point
    next_node = edges[target_node]
    if not next_node:
        return
    else:
        for next in next_node:
            #edges[next].pop(edges[next].index(target_node))
            #dfs(next, p[target_node])
            if next in done_nodes:
                pass
            else:
                dfs(next, p[target_node])

def main():
    global edges, p
    n, q = map(int, input().split())
    edges = {e: [] for e in range(1, n+1)}
    for _ in range(n - 1):
        a, b = tuple(map(int, input().split()))
        edges[a].append(b)
        edges[b].append(a)
    p = {e: 0 for e in range(1, n+1)}
    for _ in range(q):
        p1, x1 = map(int, input().split())
        p[p1] += x1

    dfs(1, 0)
    for i1 in range(1, n + 1):
        print(p[i1], end=' ')

if __name__ == '__main__':
    main()

### FIXED CODE ###

import sys
input = sys.stdin.readline
sys.setrecursionlimit(10**6)
edges = {}
p = {}
done_nodes = set()

def dfs(target_node, keisyo_point):
    global p
    done_nodes.add(target_node)
    p[target_node] += keisyo_point
    next_node = edges[target_node]
    if not next_node:
        return
    else:
        for next in next_node:
            #edges[next].pop(edges[next].index(target_node))
            #dfs(next, p[target_node])
            if next in done_nodes:
                pass
            else:
                dfs(next, p[target_node])

def main():
    global edges, p
    n, q = map(int, input().split())
    edges = {e: [] for e in range(1, n+1)}
    for _ in range(n - 1):
        a, b = tuple(map(int, input().split()))
        edges[a].append(b)
        edges[b].append(a)
    p = {e: 0 for e in range(1, n+1)}
    for _ in range(q):
        p1, x1 = map(int, input().split())
        p[p1] += x1

    dfs(1, 0)
    for i1 in range(1, n + 1):
        print(p[i1], end=' ')

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

readline = open(0).readline
write = open(1, 'w').write

N = int(readline())
P = [list(map(int, readline().split())) for i in range(N)]
P.sort(key=lambda x: x[0]+x[1])

L = 10**5
dp = [0]*L
for w, s, v in P:
    for i in range(s+w, w-1, -1):
        dp[i] = max(dp[i], dp[i-w] + v)
write("%d\n" % max(dp))

### FIXED CODE ###

N = int(input())
P = [list(map(int, input().split())) for i in range(N)]
P.sort(key=lambda x: x[0]+x[1])

L = 10**5
dp = [0]*L
for w, s, v in P:
    for i in range(s, -1, -1):
        dp[i+w] = max(dp[i+w], dp[i] + v)
print(max(dp))
### BUGGY CODE ###

import fractions
a,b,c,d = map(int, input().split())
gcd = fractions.gcd(c,d)
lcm = c * d // gcd
num = [c,d,lcm]
l = b - a + 1
temp = []

for i in range(3):
  count = 0
  if l - num[i] >= 0:
    count += l // num[i]
    if l % num[i] != 0:
      if b % num[i] < (b - (l % num[i]) + 1) % num[i]:
        count += 1
  else:
    for j in range(a,b+1):
      if j % num[i] == 0:
        count += 1
  temp.append(count)

ans = l - (temp[0] + temp[1] - temp[2])
print(ans)

### FIXED CODE ###

import fractions
a,b,c,d = map(int, input().split())
gcd = fractions.gcd(c,d)
lcm = c * d // gcd
num = [c,d,lcm]
l = b - a + 1
temp = []

for i in range(3):
  count = 0
  if l - num[i] >= 0:
    count += l // num[i]
    if l % num[i] != 0:
      if b % num[i] < (b - (l % num[i]) + 1) % num[i]:
        count += 1
  else:
    if b % num[i] < l:
        count += 1
  temp.append(count)

ans = l - (temp[0] + temp[1] - temp[2])
print(ans)
### BUGGY CODE ###

n = int(input())
a = list(map(int, input().split()))
end = sorted(a)[1]

for i in range(end+1, 0, -1):
  x = 0
  for j in a:
    if j % i != 0:
      x += 1
  if x <= 1:
    print(i)
    break

### FIXED CODE ###

n = int(input())
a = list(map(int, input().split()))
end = sorted(a)[1]

for i in range(end+1, 0, -1):
  x = 0
  for j in a:
    if j % i != 0:
      x += 1
    if x >= 2:
      break
  if x <= 1:
    print(i)
    break
### BUGGY CODE ###

n = int(input())

dp = [[0 for __ in range(1 << n)] for _ in range(n+1)]
dp[0][0] = 1

for i in range(n):
    a = [int(x) for x in input().split()]
    for j in range(n):
        for bit in range(1 << n):
            if a[j] == 1 and (bit & 1 << j):
                dp[i+1][bit] += dp[i][bit ^ (1 << j)]

print(dp[n][2**n-1])

### FIXED CODE ###

mod = 10**9+7

n = int(input())
a = [[int(x) for x in input().split()] for _ in range(n)]

dp = [-1 for __ in range(1 << n)]
dp[0] = 1


def dfs(bit, i):
    if dp[bit] != -1:
        return dp[bit]
    else:
        tmp = 0
        for j in range(n):
            if bit & (1 << j) and a[i][j]:
                tmp += dfs(bit ^ (1 << j), i+1)
    dp[bit] = tmp % mod
    return dp[bit]


print(dfs(2**n-1, 0))
### BUGGY CODE ###

from collections import Counter,defaultdict,deque
import sys
import copy
from itertools import permutations, combinations
from heapq import heappop, heappush
input = sys.stdin.readline
sys.setrecursionlimit(10**8)
mod = 10**9+7

def main():
    n=int(input())
    graph = [[] for _ in range(n)]
    for _ in range(n-1):
        a,b,w=map(int,input().split())
        a-=1
        b-=1
        graph[a].append((b,w))
        graph[b].append((a,w))
    graph = tuple(graph)
    q,k = map(int,input().split())
    pre = []
    que = deque()
    for e in range(n):
        dis = [-1 for _ in range(n)]
        dis[e]=0
        if e == k-1:
            pre.append(0)
        else:
            que.append(e)
        while que:
            i = que.pop()
            for j in range(len(graph[i])):
                go = graph[i][j][0]
                d = graph[i][j][1]
                if dis[go]!=-1:
                    continue
                dis[go] = dis[i] + d
                if k-1 == go:
                    pre.append(dis[go])
                    que=deque()
                    break
                que.append(go)
    pre = tuple(pre)
    for _ in range(q):
        x,y = map(int,input().split())
        print( pre[x-1] + pre[y-1] ) 

if __name__ == "__main__":
    main()

### FIXED CODE ###

from collections import Counter,defaultdict,deque
import sys
import copy
from itertools import permutations, combinations
from heapq import heappop, heappush
input = sys.stdin.readline
sys.setrecursionlimit(10**8)
mod = 10**9+7

def main():
    n=int(input())
    graph = [[] for _ in range(n)]
    for _ in range(n-1):
        a,b,w=map(int,input().split())
        a-=1
        b-=1
        graph[a].append((b,w))
        graph[b].append((a,w))
    graph = tuple(graph)
    q,k = map(int,input().split())
    que = deque([k-1])
    dis = [-1 for _ in range(n)]
    dis[k-1]=0
    while que:
        i = que.pop()
        for j in range(len(graph[i])):
            go = graph[i][j][0]
            d = graph[i][j][1]
            if dis[go]==-1:
                dis[go] = dis[i] + d
                que.append(go)
    for _ in range(q):
        x,y = map(int,input().split())
        print( dis[x-1] + dis[y-1] ) 

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

import math
import numpy as np
k = int(input())

Map = [[0 for j in range(k)] for i in range(k)]
for i  in range(1,k+1):
    for j in range(1,k+1):
        tmp = math.gcd(i,j)
        Map[i-1][j-1] = tmp
        Map[j-1][i-1] = tmp

ans = 0
for i in range(1,k+1):
    for j in range(1,k+1):
        for x in range(1,k+1):
            tmp = [i,j,x]
            tmp_ans = Map[tmp[0]-1][tmp[2]-1]
            ans += Map[tmp_ans-1][tmp[1]-1]
            
            
print(ans)


### FIXED CODE ###

import math


k = int(input())
ans = 0
for i in range(1,k+1):
    for j in range(1,k+1):
        tmp = math.gcd(i,j)
        for x in range(1,k+1):
            ans +=math.gcd(tmp,x) 

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

N = int(input())
S = [input() for i in range(N) ]
counter = 0
for i in range(N):
    for j in range(i+1,N):
        if set(S[i]) == set(S[j]):
            if sorted(S[i]) == sorted(S[j]):
                counter += 1
print(counter)


### FIXED CODE ###

import math
def combinations_count(n, r):
    return math.factorial(n) // (math.factorial(n - r) * math.factorial(r))

N = int(input())
dic_s = {}
for i in range(N):
    s = "".join(sorted(input()))
    if s in dic_s:
        dic_s[s] += 1
    else:
        dic_s[s] = 1
counter = 0
for key,value in dic_s.items():
    if value >1:
        counter += combinations_count(value,2)
print(counter)
### BUGGY CODE ###

from collections import deque
n,q=map(int,input().split())
tree=[[] for _ in range(n)]
for i in range(n-1):
    a,b=map(int,input().split())
    a-=1
    b-=1
    tree[a].append(b)
    tree[b].append(a)
cnt=[0]*n
for i in range(q):
    p,x=map(int,input().split())
    cnt[p-1]+=x

stack=deque([0])
visited=[0]*n
visited[0]=1

while stack:
    cur=stack[-1]
    for i in tree[cur]:
        if visited[i]==0:
            cnt[i]+=cnt[cur]
            stack.append(i)
            visited[i]=1
            break
    else:
        stack.pop()

print(*cnt)




### FIXED CODE ###

#「探索候補スタック」「探索済みリスト」「現在地点」の３点セットでとらえる
n,q=map(int,input().split())
mat=[set() for _ in range(n)]
for _ in range(n-1):
    a,b=map(int,input().split())
    mat[a-1].add(b-1)
    mat[b-1].add(a-1) # プラスした要素
count=[0]*n
for _ in range(q):
    p,score=map(int,input().split())
    count[p-1]+=score

stack=[[0,0,-1]]
while stack:
    # print(stack)
    num,cnt,pr=stack.pop()
    count[num]+=cnt
    for k in mat[num]:
        if k==pr:
            continue
        stack.append([k,count[num],num])
print(*count)
### BUGGY CODE ###

# 2125
# 方針．f(n)を求めるのがlog(N)で終わりそうだから普通に素直に実装すればいいのでは？
N = int(input())
X = list(input())

import math
# 最初にpopcount用のリストを作成する，そもそも2**(10**5)だから圧倒的に範囲が足らなかった
L = [0 for i in range(int(math.log(N,2))+10)]
for i in range(int(math.log(N,2))+10):
    bi = list(str(bin(i)))
    bi = bi[1:]
    L[i] = bi.count('1')

# i番目のビットを反転させて,
dic={}
x0 = int(''.join(X),2)
for i in range(N):
    # ちゃんともとに戻してね，ということで本のビット
    b = int(X[i]) & 1
    bn = b ^ 1
    num = int(''.join(X),2) # できなきゃjoinで
    xi = x0 - b * pow(2,N-1-i) + bn * pow(2,N-1-i)
    num = xi
    count = 0
    while num > 0:
        bi = list(str(bin(num)))
        bi = bi[2:]
        st = ''.join(bi)
        if st in dic:
            bic = dic[st]
        else:
            bic = bi.count('1')
            dic[st] = bic
        num = num % bic
        count += 1
    print(count)


### FIXED CODE ###

# 2125
# 方針．f(n)を求めるのがlog(N)で終わりそうだから普通に素直に実装すればいいのでは？
# ただし最初だけは別に実装する必要がある
N = int(input())
X = list(input())

# i番目のビットを反転させて,
# やってることは似てるはずなのになんかうまく行かない
dic={}
bn00 = X.count('1')
x00 = int(''.join(X),2)
aa = x00 % (bn00+1)
if bn00-1==0:
    bb = 0
else:
    bb = x00 % (bn00-1)
for i in range(N):
    # ちゃんともとに戻してね，ということで本のビット
    b = int(X[i]) & 1
    bn = b ^ 1
    if bn:
        bn0 = bn00 + 1
        x0 = aa
    else:
        bn0 = bn00 - 1
        x0 = bb
    if bn0==0: # ビットが全く立っていないつまり0の時，0%0はエラーを起こすので，n%0もエラーを起こす
        print(0)
        continue
    if b: # もとのビットが立っている場合は減らす，ここの計算量が一番重いので計算量を削減してみる
        xi = x0 - b * pow(2,N-1-i,bn0)
    if bn:
        xi = x0 + bn * pow(2, N - 1 - i, bn0)
    xi %= bn0
    num = xi
    count = 1
    while num > 0:
        p = format(num,'b').count('1') # 10進数を２進数にかえるなら，これがいいのかも,int(str(i),2)を使うっていう手もあるけど周りくどい
        num = num % p
        count += 1
    print(count)
### BUGGY CODE ###

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

class Node:
    def __init__(self, id):
        self.id = id
        self.parent = self.id

N, M = [int(i) for i in input().split()]
P = [Node(i) for i in range(N)]

def root(a):
    if a.id == a.parent:
        return a.id
    else:
        id = root(P[a.parent])
        return id

def union(a, b):
    p = root(a)
    q = root(b)
    if p == q:
        return
    else:
        P[q].parent = p

for i in range(M):
    A, B = [int(i)-1 for i in input().split()]
    union(P[A], P[B])

c = defaultdict(int)
for i in range(N):
    c[root(P[i])] += 1
    maxc = 0
for key in c.keys():
    if maxc < c[key]:
        maxc = c[key]
print(maxc)

### FIXED CODE ###

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

class Node:
    def __init__(self, id):
        self.id = id
        self.parent = self.id

N, M = [int(i) for i in input().split()]
P = [Node(i) for i in range(N)]

def root(a):
    if a.id == a.parent:
        return a.id
    else:
        id = root(P[a.parent])
        a.parent = id
        return id

def union(a, b):
    p = root(a)
    q = root(b)
    if p == q:
        return
    else:
        P[q].parent = p

for i in range(M):
    A, B = [int(i)-1 for i in input().split()]
    union(P[A], P[B])

c = defaultdict(int)
for i in range(N):
    c[root(P[i])] += 1
    maxc = 0
for key in c.keys():
    if maxc < c[key]:
        maxc = c[key]
print(maxc)
### BUGGY CODE ###

N = int(input())
S = []
for i in range(N):
  Ss = input()
  S.append(Ss)
r = 0
for i in range(N):
  T = S[i:]+S[:i]
  ok = True
  for i in range(N):
    for j in range(i+1, N):
      if T[i][j] != T[j][i]:
        ok = False
        break
  if ok:
    r += 1
r *= N
print(r)


### FIXED CODE ###

N = int(input())
S = []
for i in range(N):
  Ss = input()
  S.append(Ss)
r = 0
for i in range(N):
  T = S[i:]+S[:i]
  ok = True
  for i in range(N):
    for j in range(i+1, N):
      if T[i][j] != T[j][i]:
        ok = False
        break
  if ok:
    r += 1
r *= N
print(r)
### BUGGY CODE ###

n = int(input())
lis = list(map(int, input().split()))
 
for a, b in enumerate(lis):
    if b != min(lis[:a+1]) :
        n -= 1
print(n)

### FIXED CODE ###

n = int(input())
lis = list(map(int, input().split()))
inf = 10 ** 15
ans = 0
for i in lis:
    if i < inf:
        ans += 1
        inf = i
print(ans)
### BUGGY CODE ###

N=int(input())
a=[int(e) for e in input().split()]
flg=0
for i in range(N-1):
    for j in range(i+1,N):
      if a[i]==a[j]:
          flg=1
if(flg==1):
    print("NO")
else:
    print("YES")

### FIXED CODE ###

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

a.sort()
flg=0
if(a[0]==a[1]):
    flg=1
for i in range(1,N-1):
    if(a[i]==a[i-1]):
        flg=1
if flg==1:
    print("NO")
else:
    print("YES")
### BUGGY CODE ###

n = int(input())
R = []
P = []

R.append(int(input()))
for i in range(1, n):
    r = int(input())
    P.append(r-min(R))
    R.append(r)

P.sort()
print(P[-1])

### FIXED CODE ###

import sys

n = int(input())
r0 = int(input())
r1 = int(input())
p = r1 - r0
r = min(r0,r1)
for i in map(int, sys.stdin.readlines()):
    if p < i - r:
        p = i - r
    if r > i:
        r = i

print(p)
### BUGGY CODE ###

n = input()
A = list(map(int, input().split()))
i = 0
while True:
    odd = [a for a in A if a % 2]
    if len(odd) > 0:
        break
    A = map(lambda x: x/2, A)
    i+=1
print(i)


### FIXED CODE ###

from time import sleep
n = input()
A = list(map(int, input().split()))
i = 0
while True:
    if len([a for a in A if a % 2]) > 0:
        break
    A = list(map(lambda x: x/2, A))
    i+=1
print(i)
### BUGGY CODE ###

import sys
sys.setrecursionlimit(10*10)

N = int(input())
A = list(map(int,input().split()))
result = 1
for i in range(N):
    result = result * A[i]
if result > 10**18:
    print(-1)
else:
    print(result)

### FIXED CODE ###

import sys
def input():
    return sys.stdin.readline()[:-1]

N = int(input())
A = list(map(int,input().split()))
A.sort()
result = 1
for i in range(N):
    result = result * A[i]
    if result > 1e18:
        result = -1
        break
print(result)
### BUGGY CODE ###

# -*- coding: utf-8 -*-
from sys import stdin

n = int(stdin.readline().rstrip())
data = [stdin.readline().rstrip() for _ in range(n)]
new = []
for i in range(n):
    sort = sorted(data[i])
    sorting = "".join(sort)
    new.append(sorting)
new.sort()
score = 0
s = 0
count  = 0
while s<n-1:
    daburi = 1
    stop = 0
    for p in range(s,n-1):
        if new[p] == new[p+1] and stop == 0:
            daburi += 1
        else:
            stop += 1
    score += daburi*(daburi-1)//2
    count += daburi
    s = count
print(score)


### FIXED CODE ###

# -*- coding: utf-8 -*-
from sys import stdin

n = int(stdin.readline().rstrip())
data = [stdin.readline().rstrip() for _ in range(n)]
new = []
for i in range(n):
    sort = sorted(data[i])
    sorting = "".join(sort)
    new.append(sorting)
new.sort()
score = 0
s = 0
count  = 0
while s<n-1:
    daburi = 1
    for p in range(s,n-1):
        if new[p] == new[p+1]:
            daburi += 1
        else:
            break
    score += daburi*(daburi-1)//2
    count += daburi
    s = count
print(score)
### BUGGY CODE ###

# 入力
N = int(input())
c = [0]*4
for a in input().split():
    c[int(a)] += 1

# DPテーブルを初期化
dp = [[[-1 for k in range(310)] for j in range(310)] for i in range(310)]
dp[0][0][0] = 0


for k in range(0, c[3] + 1):
    for j in range(0, c[2]+c[3]-k + 1):
        for i in range(0, c[1]+c[2]+c[3]-j-k + 1):
            if i == j == k == 0:
                continue
            temp = N+i*dp[i - 1][j][k]+j * \
                dp[i + 1][j - 1][k]+k*dp[i][j + 1][k - 1]
            dp[i][j][k] = temp / (i + j + k)


# 答えを得て出力
print(dp[c[1]][c[2]][c[3]])


### FIXED CODE ###

import collections

# 入力
N = int(input())
c = collections.Counter(list(map(int, input().split())))

# DPテーブルを初期化
dp = [[[0.0 for k in range(310)] for j in range(310)] for i in range(310)]


for k in range(0, c[3] + 1):
    for j in range(0, c[2]+c[3]-k + 1):
        for i in range(0, c[1]+c[2]+c[3]-j-k + 1):
            if i == j == k == 0:
                continue
            dp[i][j][k] = (N+i*dp[i - 1][j][k]+j *
                           dp[i + 1][j - 1][k]+k*dp[i][j + 1][k - 1])/(i+j+k)


# 答えを得て出力
print(dp[c[1]][c[2]][c[3]])
### BUGGY CODE ###

#14:07
s = input()
l = len(s)
cnt = 0
ans = 0
for i in range(l):
  if s[i] == '1':
    cnt += 1
    ans += 3**(l-1-i) * 2**(cnt-1)
ans += 2**cnt
print(ans%(10**9+7))

### FIXED CODE ###

#16:17
s = input()
n = len(s)
mod = 10 ** 9 + 7
left = [1]
stand = [1]
right = [1]
for i in range(1,n):
  right.append(right[-1] * 3 % mod)
  if s[i] == '1':
    left.append(left[-1] * 2 % mod)
    stand.append(1)
  else:
    left.append(left[-1])
    stand.append(0)
right.reverse()
ans = 0
for i in range(n):
  ans += left[i] * right[i] * stand[i]
  ans %= mod
#print(left)
#print(right)
#print(stand)
ans += left[-1] * 2
ans %= mod
print(ans)
### BUGGY CODE ###

n = int(input())
import math
# Method to print the divisors 
def printDivisors(n) : 
    tuples = 0
    for i in range(1, int(math.sqrt(n) + 1)) : 
          
        if (n % i == 0) : 
            if (n / i == i) : 
                tuples+=1;    #(3,3) type
            else : 
                # Otherwise print both 
                tuples+=2
    return tuples
          

overall = 0  
for c in range(n-1,0,-1):
  val = n - c
  overall+= printDivisors(val)
print(overall)
  
  


### FIXED CODE ###

N = int(input())
 
result = 0
for A in range(1, N + 1):
    result += (N - 1) // A
print(result)
### BUGGY CODE ###

tmp = input().split()
N = int(tmp[0])
M = int(tmp[1])

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

count = 0
for i in range(1, N+1):
  flag = True
  for j in range(M):
    if (cardlist[j][0] > i or cardlist[j][1] < i):
      flag = False
      break
  
  if (flag):
    count += 1

print(count)

### FIXED CODE ###

tmp = input().split()
N = int(tmp[0])
M = int(tmp[1])

max = N
min = 0
for i in range(M):
  inputcard = list(map(int, input().split()))
  if min < inputcard[0]:
    min = inputcard[0]
  
  if max > inputcard[1]:
    max = inputcard[1]
  
if (max - min + 1 < 0):
  print(0)
else:
  print(max - min + 1)