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

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

if N == 1:
    print(1)
elif N == 2:
    print(1)
else:
    cnt = 0
    for i in range(N - 1):
        if A[i] == A[i + 1]:
            A[i] = 0
            cnt += 1

    for _ in range(cnt):
        A.remove(0)
    #print(A)

    i = 1
    ans = 1
    while i < len(A) - 1:
        if A[i-1] < A[i] < A[i+1] or A[i-1] > A[i] > A[i+1]:
            pass
        else:
            i += 1
            ans += 1
        i += 1
    print(ans)



### FIXED CODE ###

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

if N == 1:
    print(1)
elif N == 2:
    print(1)
else:
    A = [B[0]]
    cnt = 0
    for i in range(N - 1):
        if B[i] == B[i + 1]:
            pass
        else:
            A.append(B[i+1])

    i = 1
    ans = 1
    n = len(A)
    while i < n - 1:
        if A[i-1] < A[i] < A[i+1] or A[i-1] > A[i] > A[i+1]:
            pass
        else:
            i += 1
            ans += 1
        i += 1
    print(ans)
### BUGGY CODE ###

N = int(input())
A = list(map(int,input().split()))
MOD = 10**9+7
ans = 0
for k in range(61):
    one = 0
    zero = 0
    for i in range(N):
        if A[i]%2==0:zero+=1
        else:one+=1
        A[i]//=2
    ans += (one*zero)*(2**k)
print(ans%MOD)

### FIXED CODE ###

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

mod = pow(10,9)+7

K = 60
P = [0]*K
Z = [0]*K
for a in A:
    n = a
    for i in range(K):
        b = n%2
        if b:P[i]+=1
        else:Z[i]+=1
        n//=2
ans = 0
for k in range(K):
    ans+=(pow(2,k,mod)*(P[k]*Z[k]))%mod
print(ans%mod)
### BUGGY CODE ###

n = int(input())
s = input()

ans = 0
for a in range(0,n-2):
    for b in range(a,n-1):
        e = b-a
        #if s[a]!=s[b]:
        for c in range(b,n):
            f = c-b
            if e!=f:
                if s[a]!=s[c] and s[b]!=s[c] and s[a]!=s[b]:
                    ans += 1

print(ans)

### FIXED CODE ###

n = int(input())
s = input()

r = s.count("R")
g = s.count("G")
b = s.count("B")
ans = r*g*b

for i in range(n):
    for j in range(1,n//2+1):
        if i+2*j>=n:
            break
        
        if s[i]!=s[i+j] and s[i+j]!=s[i+2*j] and s[i]!=s[i+2*j]:
            ans -= 1
print(ans)
### BUGGY CODE ###

import numpy
input_line=input().split(" ")
N,K=int(input_line[0]),int(input_line[1])
P=input().split(" ")

for i in range(N):
    P[i]=int(P[i])
expect=[]
for i in range(N):
    expect.append((P[i]+1)/2)

total_box=[]
for j in range(N-K+1):
    total=0
    for i in range(j,K+j):
        total=total+expect[i]
    total_box.append(total)
    
max_value = max(total_box)
max_index = total_box.index(max_value)
print(max_value)

### FIXED CODE ###

input_line=input().split(" ")
N,K=int(input_line[0]),int(input_line[1])
P=input().split(" ")
cumsum=[0]
tol=0
for i in range(N):
    P[i]=(int(P[i])+1)/2
    tol=tol+P[i]
    cumsum.append(tol)
    
k_sum=[]

for i in range(N-K+1):
  k_sum.append(cumsum[i+K]-cumsum[i])  

ans=max(k_sum)
print(ans)
### BUGGY CODE ###

n, a, b = map(int, input().split())
mod = 10 ** 9 + 7


def pow(n):
    if n == 0:
        return 1
    x = pow(n//2)
    x *= x
    if n % 2 == 1:
        x *= 2
    return x


# 逆元配列の作成
inv = [1] * (2 * (10 ** 5))
for i in range(2, 2 * (10 ** 5)):
    inv[i] = -inv[mod % i] * (mod // i)
    inv[i] %= mod


def comb(n, a):
    res = 1
    for i in range(a):
        res *= n - i  # 分子
        res *= inv[i + 1]  # 分母
        res %= mod  # modで割ったあまり
    return res


ans = pow(n) - 1 - comb(n, a) - comb(n, b)

ans %= mod
if ans < 0:
    ans += mod

print(ans)


### FIXED CODE ###

n, a, b = map(int, input().split())
mod = 10 ** 9 + 7

# 逆元配列の作成
inv = [1] * (2 * (10 ** 5)+1)
for i in range(2, 2 * (10 ** 5)+1):
    inv[i] = -inv[mod % i] * (mod // i)
    inv[i] %= mod


def comb(n, a):
    res = 1
    for i in range(a):
        res *= n - i  # 分子
        res *= inv[i + 1]  # 分母
        res %= mod  # modで割ったあまり
    return res


ans = pow(2, n, mod) - 1 - comb(n, a) - comb(n, b)

ans %= mod
if ans < 0:
    ans += mod

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

import queue

N = int(input())

pos = []
for _ in range(N):
    a, b = map(int, input().split())
    pos.append((a - 1, b - 1))

visited = {v: False for v in pos}
que = queue.PriorityQueue()
que.put((0, pos[0]))

res = 0
while not que.empty():
    cost, vertex = que.get()
    if visited[vertex]:
        continue
    visited[vertex] = True
    res += cost

    for i in range(N):
        next_cost = min(abs(pos[i][0] - vertex[0]), abs(pos[i][1] - vertex[1]))
        que.put((next_cost, (pos[i][0], pos[i][1])))

print(res)


### FIXED CODE ###

import queue

N = int(input())

pos = []
for _ in range(N):
    a, b = map(int, input().split())
    pos.append((a, b))

visited = {v: False for v in pos}
edges = {v: [] for v in pos}
x_sorted = sorted([(p[0], i) for i, p in enumerate(pos)])
for i in range(len(x_sorted) - 1):
    j = x_sorted[i][1]
    l = x_sorted[i+1][1]
    edges[pos[j]].append((pos[l], abs(pos[l][0] - pos[j][0])))
    edges[pos[l]].append((pos[j], abs(pos[l][0] - pos[j][0])))
y_sorted = sorted([(p[1], i) for i, p in enumerate(pos)])
for i in range(len(y_sorted) - 1):
    j = y_sorted[i][1]
    l = y_sorted[i+1][1]
    edges[pos[j]].append((pos[l], abs(pos[l][1] - pos[j][1])))
    edges[pos[l]].append((pos[j], abs(pos[l][1] - pos[j][1])))

que = queue.PriorityQueue()
que.put((0, pos[0]))

res = 0
while not que.empty():
    cost, vertex = que.get()
    if visited[vertex]:
        continue
    visited[vertex] = True
    res += cost

    for to, next_cost in edges[vertex]:
        if not visited[to]:
            que.put((next_cost, to))

print(res)
### BUGGY CODE ###

import sys

n = int(input())
a = []
for _ in range(n):
    a.append(list(map(int, input().split())))
ans = 0
pos = [0] * n

while any([(n - 1) - x for x in pos]):
    pos_check = [False] * n
    checker = True
    for i in range(n):
        for j in range(i + 1, n):
            if pos[i] == n - 1 or pos[j] == n - 1:
                continue
            if a[i][pos[i]] == j + 1 and a[j][pos[j]] == i + 1:
                pos_check[i] = True
                pos_check[j] = True
    for i in range(n):
        if pos_check[i]:
            pos[i] += 1
            checker = False
    if checker:
        print(-1)
        sys.exit()
    ans += 1
print(ans)


### FIXED CODE ###

n = int(input())
a = [list(map(int, input().split())) for _ in range(n)]

l = [i for i in range(n)]
pos = [0] * n
res = 0
cnt = 0
while True:
    res += 1
    flag = True
    tmp = l.copy()
    l = []
    used = [False] * n
    for v in tmp:
        if used[v] or pos[v] == n - 1:
            continue

        opp = a[v][pos[v]] - 1

        if used[opp] or pos[opp] == n - 1:
            continue

        if a[opp][pos[opp]] - 1 == v:
            pos[v] += 1
            pos[opp] += 1
            l.append(v)
            l.append(opp)
            used[v] = True
            used[opp] = True
            flag = False
            if pos[v] == n - 1:
                cnt += 1
            if pos[opp] == n - 1:
                cnt += 1

    if flag:
        print(-1)
        break

    if cnt == n:
        print(res)
        break
### BUGGY CODE ###

#初期入力
import sys
input = sys.stdin.readline
import random
N = int(input())
connection   ={i:set() for i in range(1,N+1)}
A            ={i:tuple() for i in range(1,N+1)}
for i in range(N-1):
    a,b = (int(x) for x in input().split())
    connection[a].add(b) # つながりを逆向きも含めて入力
    connection[b].add(a) # 
    A[i]=a,b             #色を出力するため

#色の数(各頂点の最大値)
color_max =0
for i in connection.values():
    color_max =max(color_max, len(i) )

#各頂点に色を準備⇒辺の色決定
A_sort =sorted(A)
color_vertex ={i:set() for i in range(1,N+1)} #辺につながっている頂点に使った色
color_side =[0]*(N-1)

color_all =set(j for j in range(color_max) ) #0～color_max-1
for i in range(N-1):
    color =0
    while True:
        q,color =divmod(color,color_max)
        v_a,v_b = A[i] #i番目の辺とつながっている頂点
        #color =(color_all - color_vertex[v_a] -color_vertex[v_b]) #全ての色-使った色[a]-使った色[b]
        if color not in color_vertex[v_a] and color not in color_vertex[v_b]: 
            color_side[i] =color+1          #辺の色を出力用に決める。1～color_max
            color_vertex[v_a].add(color)    #前の頂点に使った色として追加
            color_vertex[v_b].add(color)    #先の頂点に使った色として追加
            break
        else:
            color +=1      
#出力
print(color_max)
print(*color_side, sep="\n")

### FIXED CODE ###

"""
参考    yy4さん 2019-11-24 21:24:43
516 ms          PyPy3 (2.4.0)
"""
#def solve():
from collections import deque
import sys

input = sys.stdin.readline

n = int(input())

g = tuple(set() for _ in range(n))
for idx in range(n - 1):
    a, b = (int(x) - 1 for x in input().split())
    g[a].add((b, idx))
    g[b].add((a, idx))

q = deque()
q.append((0, -1, -1))

e = [-1] * n  # e[-1]は使わない
used = [False] * n
used[0] = True
while q:
    v, v_idx, prev_color = q.popleft()
    curr = 1 if prev_color != 1 else 2
    for u, u_idx in g[v]:
        if used[u]:
            continue
        used[u] = True
        e[u_idx] = curr
        q.append((u, u_idx, curr))
        curr += 1
        if curr == prev_color:
            curr += 1

ret = e[:-1]
#return len(set(ret)), ret

    
#l, ret = solve()
l=len(set(ret))
print(l)
print(*ret, sep='\n')
### BUGGY CODE ###

n=int(input())

s=[]
so=[]
for i in range(n):
    s.append(input())
    so.append(sorted(s[i]))
count=0
for i in range(n-1):
    for j in range(n-i-1):
        if so[i]==so[n-j-1]: 
            count=count+1


print(count)

### FIXED CODE ###

n =int(input())

s=[]
ans=0
count=1

for i in range(n):
    s.append("".join(sorted(input())))

s.sort()
for i in range(n-1):
    if s[i] == s[i+1]:
        count=count+1
    else:
        ans=ans+count*(count-1)/2
        count=1

ans=ans+count*(count-1)/2

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

N,K = map(int,input().split()) #N = 4,K=5
A = [int(i)-1 for i in input().split()]
log_K = K.bit_length() #3bit (5 = 101)
next = [[-1]*N for _ in range(log_K)]

for i in range(N):
    next[0][i] = A[i]
    
for k in range(log_K - 1):
    for i in range(N):
        next[k+1][i] = next[k][next[k][i]]  

now = 0
for i in range(log_K)[::-1]: 
    if ((K >> i) & 1) == 1: 
        now = next[i][now]
print(now + 1) 

### FIXED CODE ###

N,K = map(int,input().split()) #N = 4,K=5
A = [int(i)-1 for i in input().split()]
log_K = K.bit_length() #3bit (5 = 101)
next = [[-1]*N for _ in range(log_K)]

for i in range(N):
    next[0][i] = A[i]
    
for k in range(log_K - 1):
    for i in range(N):
        next[k+1][i] = next[k][next[k][i]]  

now = 0
for i in range(log_K)[::-1]: 
    if ((K >> i) & 1) == 1: 
        now = next[i][now]
print(now + 1)
### BUGGY CODE ###

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

### FIXED CODE ###

N = int(input())
A = sorted(list(map(int, input().split())))
C = 1
for i in range(N):
  C *= A[i]
  if C > 10**18:
    print('-1')
    break
  elif A[i]==0:
    break
if C <= 10**18:
  print(C)
### BUGGY CODE ###

from itertools import accumulate
def add(B,a,n):#リストに値を追加する関数
    x = a
    while x <= n:
        B[x] += 1
        x += x&(-x)

def sums(B,a):#a番目までの和
    x = a
    S = 0
    while x != 0:
        S += B[x]
        x -= x&(-x)
    return S


def invnumber(n, S):# #{(i,j)| i<j and S[i]<=S[j]}
    B = [0]*(n*2 + 1)
    invs = 0
    for i in range(n):
        s = S[i] + n
        invs += sums(B, s)
        add(B, s, n*2)
    return invs

N = int( input())
A = list( map( int, input().split()))
R = max(A)+1
L = 0
c = (N*(N-1)//2 + 1)//2

while R - L > 1:
    M = (R+L)//2
    S = [0]*N
    if A[0] >= M:
        S[0] = 1
    else:
        S[0] = -1
    for i in range(1,N):
        if A[i] >= M:
            S[i] = S[i-1] + 1
        else:
            S[i] = S[i-1] - 1
    if invnumber(N,S) >= c:
        L = M
    else:
        R = M
print(L)


### FIXED CODE ###

def add(B,a,n):#リストに値を追加する関数
    x = a
    while x <= n:
        B[x] += 1
        x += x&(-x)

def sums(B,a):#a番目までの和
    x = a
    S = 0
    while x != 0:
        S += B[x]
        x -= x&(-x)
    return S


def invnumber(n, S):# #{(i,j)| i<j and S[i]<=S[j]}
    B = [0]*(n*2 + 1)
    invs = 0
    for i in range(n):
        s = S[i] + n
        invs += sums(B, s)
        add(B, s, n*2)
    return invs

N = int( input())
A = list( map( int, input().split()))
R = max(A)+1
L = 0
c = (N*(N+1)//2 + 1)//2
while R - L > 1:
    M = (R+L)//2
    S = [0]*(N+1)
    for i in range(1,N+1):
        if A[i-1] >= M:
            S[i] = S[i-1] + 1
        else:
            S[i] = S[i-1] - 1
    if invnumber(N+1,S) >= c:
        L = M
    else:
        R = M
print(L)
### BUGGY CODE ###

def sieve_of_eratosthenes(ub):
    # O(n loglog n) implementation.
    # returns prime numbers <= ub.
    if ub < 2:
        return []
    prime = [True]*(ub+1)
    prime[0] = False
    prime[1] = False
    p = 2
    while p*p <= ub:
        if prime[p]:
            # don't need to check p+1 ~ p^2-1 (they've already been checked).
            for i in range(p*p, ub+1, p):
                prime[i] = False
        p += 1
    return [i for i in range(ub+1) if prime[i]]

Q = int(input())
primes = sieve_of_eratosthenes(10**5)
cum_sum = [0]*(10**5+1)
for i in range(1, 10**5+1):
    if i in primes and (i+1) // 2 in primes:
        cum_sum[i] = cum_sum[i-1] + 1
    else:
        cum_sum[i] = cum_sum[i-1]

for _ in range(Q):
    l, r = map(int, input().split())
    ans = cum_sum[r] - cum_sum[l-1]
    print(ans)

### FIXED CODE ###

def sieve_of_eratosthenes(ub):
    # O(n loglog n) implementation.
    # returns prime numbers <= ub.
    if ub < 2:
        return []
    prime = [True]*(ub+1)
    prime[0] = False
    prime[1] = False
    p = 2
    while p*p <= ub:
        if prime[p]:
            # don't need to check p+1 ~ p^2-1 (they've already been checked).
            for i in range(p*p, ub+1, p):
                prime[i] = False
        p += 1
    return prime

Q = int(input())
primes = sieve_of_eratosthenes(10**5)
cum_sum = [0]*(10**5+1)
for i in range(1, 10**5+1):
    if primes[i] and primes[(i+1) // 2]:
        cum_sum[i] = cum_sum[i-1] + 1
    else:
        cum_sum[i] = cum_sum[i-1]

for _ in range(Q):
    l, r = map(int, input().split())
    ans = cum_sum[r] - cum_sum[l-1]
    print(ans)
### BUGGY CODE ###

import math


def is_prime(num):
    for i in range(2, max(num, math.floor(math.sqrt(num)))):
        if num % i == 0:
            return False
    return True


N = int(input())
nums = [int(input()) for _ in range(N)]
ans = len([num for num in nums if is_prime(num)])
print(ans)

### FIXED CODE ###

import math


def is_prime(num):
    if num == 2:
        return True
    elif not num & 1:
        return False

    for i in range(3, math.ceil(math.sqrt(num))+1, 2):
        if num % i == 0:
            return False
    return True


N = int(input())
nums = [int(input()) for _ in range(N)]
ans = len([num for num in nums if is_prime(num)])
print(ans)
### BUGGY CODE ###

import fractions
from functools import reduce
import sys
sys.setrecursionlimit(10**9)
mod = 10**9+7
def lcm_base(x, y):
    return (x * y) // fractions.gcd(x, y)
def lcm(*numbers):
    return reduce(lcm_base, numbers, 1)
def lcm_list(numbers):
    return reduce(lcm_base, numbers, 1)

N = int(input())
A = list(map(int,input().split()))
fact = [1]*(N+1)
rfact = [1]*(10**7)
r = 1
for i in range(1, N+1):
  fact[i] = r = r * i % mod
rfact[N] = r = pow(fact[N], mod-2, mod)
value = lcm_list(A)
ans = 0
for i in range(N):
    ans += value//A[i]
    #ans += value*rfact[A[i]]
    #print(value,A[i],mod)
    #ans += (value*rfact[A[i]])%mod
    #print(value,A[i],rfact[A[i]],mod)
print(ans%mod)

### FIXED CODE ###

import fractions
from functools import reduce
# Python3 program to compute LCM of 
# array elements modulo M
MAX = 10**6+1
mod = 1000000007
prime = [0 for i in range(MAX)] 
max_map = dict() 
# function to return a^n 
def power(a, n):
	if n == 0: 
		return 1
	p = power(a, n // 2) % mod
	p = (p * p) % mod
	if n & 1: 
		p = (p * a) % mod
	return p 

# function to find the smallest prime
# factors of numbers upto MAX
def sieve(): 
	prime[0], prime[1] = 1, 1
	for i in range(2, MAX): 
		if prime[i] == 0: 
			for j in range(i * 2, MAX, i): 
				if prime[j] == 0: 
					prime[j] = i 
			prime[i] = i 

# function to return the LCM modulo M 
def lcmModuloM(arr, n): 
	for i in range(n): 
		num = arr[i] 
		temp = dict() 
		# temp stores mapping of prime factors 
		# to its power for the current element 
		while num > 1:
			# factor is the smallest prime
			# factor of num
			factor = prime[num]
			# Increase count of factor in temp
			if factor in temp.keys():
				temp[factor] += 1
			else:
				temp[factor] = 1
			# Reduce num by its prime factor
			num = num // factor
		for i in temp:
			# store the higest power of every prime
			# found till now in a new map max_map
			if i in max_map.keys():
				max_map[i] = max(max_map[i], temp[i])
			else: 
				max_map[i] = temp[i]
	ans = 1
	for i in max_map:
		ans = (ans * power(i, max_map[i])) % mod
	return ans
# Driver code
sieve()
X = int(input())
A = list(map(int,input().split()))
N = max(A)
value = lcmModuloM(A, X)
ans = 0
for i in range(X):
    ans += value*pow(A[i], mod-2, mod)%mod
print(ans%mod)
### BUGGY CODE ###

# python template for atcoder1
import sys
sys.setrecursionlimit(10**9)
input = sys.stdin.readline

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


def dfs(l):
    ret = 0
    if len(l) == 1:
        return l[0]
    elif len(l) == 0:
        return 0
    else:
        le = len(l)
        mi = min(l)
        min_ind = l.index(mi)
        ret += mi*(min_ind+1)*(le-min_ind)
        return ret + dfs(l[:min_ind])+dfs(l[min_ind+1:])


ans = dfs(A)
print(ans)


### FIXED CODE ###

# python template for atcoder1
import sys
sys.setrecursionlimit(10**9)
input = sys.stdin.readline


class UnionFind:
    """
    sizeによる実装
    """

    def __init__(self, N):
        self.parent = [i for i in range(N)]
        self.size = [1 for _ in range(N)]

    def find(self, x):
        if self.parent[x] == x:
            return x
        else:
            return self.find(self.parent[x])

    def union(self, x, y):
        px = self.find(x)
        py = self.find(y)
        if px == py:
            return
        if self.size[px] < self.size[py]:
            self.parent[px] = py
            self.size[py] += self.size[px]
        else:
            self.parent[py] = px
            self.size[px] += self.size[py]

    def same(self, x, y):
        return self.find(x) == self.find(y)


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

Un = UnionFind(N+1)
pos = [-1]*(N+1)
for i, a in enumerate(A):
    pos[a] = i

ans = 0
for i in reversed(range(1, N+1)):
    ind = pos[i]
    left = 0
    right = 0
    if ind > 0 and A[ind] < A[ind-1]:
        left = Un.size[Un.find(ind-1)]
        Un.union(ind, ind-1)
    if ind+1 < N and A[ind+1] > A[ind]:
        right = Un.size[Un.find(ind+1)]
        Un.union(ind, ind+1)
    ans += (left+1)*(right+1)*A[ind]

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

import sys
input=sys.stdin.readline

def main():
    n,k=map(int,input().split())
    a=list(map(int,input().split()))
    b=[0]*40
    p=[1]*40
    for i in range(39):
        p[i+1]=p[i]*2
    for i in a:
        for j in range(40):
            if i&p[j]>0:
                b[j]+=1
    ans=0
    for i in range(k+1):
        kai=0
        for j in range(40):
            if i&p[j]==0:
                kai+=b[j]*p[j]
            else:
                kai+=(n-b[j])*p[j]
        ans=max(ans,kai)
    print(ans)
if __name__=='__main__':
    main()


### FIXED CODE ###

n,k=map(int,input().split())
l=list(map(int,input().split()))
a=[0]*42
for i in range(n):
    p=l[i]
    j=0
    while p>0:
        a[j]+=p%2
        p=p//2
        j+=1
ans=0
for i in range(41,-1,-1):
    if a[i]<n-a[i]:
        if k>=2**i:
            k-=2**i
            ans+=(2**i)*(n-a[i])
        else:
            ans+=(2**i)*a[i]
    else:
        ans+=(2**i)*a[i]
print(ans)
### BUGGY CODE ###

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

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

c=[0]*len(p) #期待値

for i in range(len(p)):
  
  c[i]=((p[i]+1)*p[i])/(2*p[i])

maxev=0

for i in range(len(p)-k+1):
  ev=0
  
  for j in range(k):
    ev+=c[i+j]

  if maxev==0 or maxev<ev:
    maxev=ev

print(maxev)


### FIXED CODE ###

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

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

c=[0]*len(p) #期待値

for i in range(len(p)):
  if i>0:
    c[i]=(((p[i]+1)*p[i])/(2*p[i]))+c[i-1]
  else:
    c[i]=(((p[i]+1)*p[i])/(2*p[i]))

maxev=0

for i in range(len(p)-k+1):
  ev=0

  if i==0:
    ev=c[i+k-1]
  else:
    ev=c[i+k-1]-c[i-1]

  if maxev==0 or maxev<ev:
    maxev=ev

print(maxev)
### BUGGY CODE ###

import bisect

inf = float('inf')


a,b,q = map(int,input().split())
s = [-inf] + [int(input()) for i in range(a)] + [inf]
t = [-inf] + [int(input()) for i in range(b)] + [inf]



for i in range(q):
    x = int(input())
    xs = bisect.bisect_right(s,x)
    xt = bisect.bisect_right(t,x)
    ss = [x-s[xs-1],s[xs]-x]
    tt = [x-t[xt-1],t[xt]-x]
    print(min(max(ss[0],tt[0]), max(ss[1],tt[1]), ss[0]*2+tt[1], ss[1]*2+tt[0], tt[0]*2+ss[1], tt[1]*2+ss[0]))


### FIXED CODE ###

import bisect

a,b,q = map(int,input().split())
s = [-10**11] + [int(input()) for i in range(a)] + [10**11]
t = [-10**11] + [int(input()) for i in range(b)] + [10**11]



for i in range(q):
    x = int(input())
    xs = bisect.bisect_right(s,x)
    xt = bisect.bisect_right(t,x)
    ss = [x-s[xs-1],s[xs]-x]
    tt = [x-t[xt-1],t[xt]-x]
    print(min(max(ss[0],tt[0]), max(ss[1],tt[1]), ss[0]*2+tt[1], ss[1]*2+tt[0], tt[0]*2+ss[1], tt[1]*2+ss[0]))
### 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(a,math.gcd(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):
    for c in range(1,K+1):
      ans += math.gcd(a,math.gcd(b,c))
print(ans)
### BUGGY CODE ###

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

ans = 0
for i in range(n-1):
    for j in range(i+1, n):
        ans += a[i] * a[j]
print(ans % (10**9 + 7))

### FIXED CODE ###

n = int(input())
a = list(map(int, input().split()))
b = sum(a)
ans = 0
for i in range(n-1):
    ans += a[i] *(b-a[i])
    b = b - a[i]
print(ans % (10**9 + 7))
### BUGGY CODE ###

# problem D 
s = input()
Q = int(input())
    
t = True
    
for i in range(Q):
    # input をforの中に組み込む
    query = input().split()
    if query[0] == '1':
        t = not t
    else:
        if(t and query[1] == '1') or (not t and query[1] == '2'):
            s = ''.join([query[2],s])
        else:
            s = ''.join([s,query[2]])
    
if not t:
    s = s[::-1]
        
print(s)

### FIXED CODE ###

from collections import deque

s = deque(input())
Q = int(input())
    
t = True
    
for i in range(Q):
    query = input().split()
    if query[0] == '1':
        t = not t
    else:
        if(t and query[1] == '1') or (not t and query[1] == '2'):
            s.appendleft(query[2])
        else:
            s.append(query[2])
            
s = ''.join(s)
    
if not t:
    s = s[::-1]
        
print(s)
### BUGGY CODE ###

import math
n = int(input())
def gcd(i,j,k):
    return math.gcd(math.gcd(i,j),k)
ans = 0
for i in range(1,n+1):
    for j in range(1,n+1):
        for k in range(1,n+1):
            ans += gcd(i,j,k)
print(ans)

### FIXED CODE ###

n = int(input())
import math
l = []
for i in range(1,n +1):
    for j in range(1,n+1):
        l.append(math.gcd(i,j))
ans = 0
for i in range(1, n+1):
    for j in l:
        ans += math.gcd(j,i)
print(ans)
### BUGGY CODE ###

from sys import stdin

def main():
    N, M = map(int, input().split())
    seki = set(list(range(1,N+1)))
    for i in range(M):
        l, r = map(int, stdin.readline().rstrip().split())
        #l, r = map(int, input().split())
        seki &= set(list(range(l, r+1)))

    print(len(seki))

if __name__ == '__main__':
    main()

### FIXED CODE ###

# 解説を見ての解答
from sys import stdin

n, m = map(int, stdin.readline().rstrip().split())
lr = [list(map(int, stdin.readline().rstrip().split())) for i in range(m)]

l, r = lr[0][0], lr[0][1]
for i in range(m):
    l = max(l, lr[i][0])
    r = min(r, lr[i][1])

print(max(0,r-l+1))