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

a=1
n=input()

s=input()
count=""
#print(len(s))
for i in range(len(s)):
  #print(i,s[i],count)
  if s[i]==" ":
    a*=int(count)
    count=""
    continue
  elif i==len(s)-1:
    if len(count)==0:
      a*=int(s[i])
    else:
      count+=s[i]
      #print("--------")
      a*=int(count)
  else:
    count+=s[i]
if a>10**18:
  print(-1)
else:
  print(a)

### FIXED CODE ###

a=1
n=input()
s=list(map(int,input().split()))

count=0
if 0 in s:
  print(0)
  count=1
else:
  a=1
  for i in s:
    a*=i
    if a>10**18:
      print(-1)
      break
if a<=10**18 and count!=1:
  print(a)
### BUGGY CODE ###

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

print(ans)

### FIXED CODE ###

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

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

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

while m > 0:
    idx = a.index(max(a))
    if a[idx] == 0:
        break
    a[idx] = a[idx] // 2
    m -= 1
print(sum(a))

### FIXED CODE ###

import heapq

n, m = map(int, input().split())
a = list(map(lambda x: int(x)*(-1), input().split()))
heapq.heapify(a)

while m > 0:
    a_max = heapq.heappop(a)
    if a_max == 0:
        break
    heapq.heappush(a, (-1)*(-a_max // 2))
    m -= 1
print(sum(a)*(-1))
### BUGGY CODE ###

from collections import deque

s=list(input())
q=int(input())

d = deque(s)
for i in range(q):
  qs=list(input().split())
  
  if qs[0]=='1':
    d.reverse()
  else:
    if qs[1]=='1':
      d.appendleft(qs[2])
    else:
      d.append(qs[2])

print("".join(d))


### FIXED CODE ###

from collections import deque

s=list(input())
q=int(input())
d = deque(s)
reverse=False

for i in range(q):
  qs=list(input().split())
  if qs[0]=='1':
    reverse=not reverse
  else:
    if qs[1]=='1':
      d.appendleft(qs[2]) if not reverse else d.append(qs[2])
    else:
      d.append(qs[2]) if not reverse else d.appendleft(qs[2])
#  print(d)
if reverse:
  d.reverse()
print("".join(d))
### BUGGY CODE ###

n,k=map(int,input().split())
while n>k:
    n=abs(n-k)
    
if n>abs(k-n):
    n=k-n
print(n)

### FIXED CODE ###

n,k=map(int,input().split())
a=n%k
b=k-a
if a<b:
    print(a)
else:
    print(b)
### BUGGY CODE ###

from fractions import gcd

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

ans = 10 ** 20

for i in range(N):
    for j in range(N):
        ans = min(ans, gcd(A[i], A[j]))

print(ans)


### FIXED CODE ###

from fractions import gcd

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

ans = gcd(A[0], A[1])

for i in range(2, N):
    ans = gcd(ans, A[i])


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

n = int(input())

g = [[0 for _ in range(n)] for _ in range(n)]
for i in range(n - 1):
    u, v, w = map(int, input().split())
    g[u - 1][v - 1] = w
    g[v - 1][u - 1] = w

color = [-1] * n

def dfs(v, cur = 0):
    color[v] = cur

    for next_v in range(n):
        if color[next_v] == -1 and g[v][next_v] != 0:
            if g[v][next_v] % 2 == 0:
                dfs(next_v, cur)
            else:
                dfs(next_v, 1 - cur)

dfs(0)

for c in color:
    print(c)

### FIXED CODE ###

n = int(input())

g = [[] for _ in range(n)]
for i in range(n - 1):
    u, v, w = map(int, input().split())
    g[u - 1].append((v - 1, w))
    g[v - 1].append((u - 1, w))

color = [-1] * n
dist = [0] * n

import queue
def dfs(v):
    color[v] = dist[v] % 2
    q = queue.LifoQueue()
    q.put(v)

    while not q.empty():
        vv = q.get()
        for next_v in g[vv]:
            if color[next_v[0]] == -1 and next_v[1] != 0:
                dist[next_v[0]] = dist[vv] + next_v[1]
                color[next_v[0]] = dist[next_v[0]] % 2
                q.put(next_v[0])

# 0を始点として各点までの距離を求める
dfs(0)

for c in color:
    print(c)
### BUGGY CODE ###

import sys

input=sys.stdin.readline
n,k=map(int,input().split())
a=list(map(int,input().split()))

def main():
  dp=[[0]*(k+1) for _ in range(n+1)]
  mod=1000000007
  #i人目までに0個配る方法は1通り
  #for i in range(n+1):
  #  dp[i][0]=1
  for i in range(0,n+1):
    for j in range(0,k+1):
      if i==0 and j==0:
        dp[i][j]=1
        break
      if j==0:
        dp[i][j]=1
        continue
      tmp=dp[i - 1][j] + dp[i][j - 1]
      if tmp>=mod:
        tmp%=mod
      dp[i][j]=tmp
      if j-a[i-1]-1>=0:
        tmp=dp[i][j]-dp[i-1][j-a[i-1]-1]
        if tmp>=mod:
          tmp%=mod
        dp[i][j]=tmp
    #print(dp)   
  print(dp[n][k])
main()

### FIXED CODE ###

import sys
from itertools import accumulate

def main():
  input=sys.stdin.readline
  n,k=map(int,input().split())
  A=list(map(int,input().split()))
  mod=10**9+7
  dp=[0]*(k+1)
  dp[0]=1
  for a in A:
    dp=list(accumulate(dp))
    #print("accumulated",dp)
    for j,d in enumerate(dp[:k-a],start=a+1):
      dp[j]-=d
    dp=[dpi%mod for dpi in dp]
    #print(dp)
  print(dp[k])
"""
def main():
  dp=[[0]*(k+1) for _ in range(n+1)]
  mod=1000000007
  #i人目までに0個配る方法は1通り
  #for i in range(n+1):
  #  dp[i][0]=1
  for i in range(0,n+1):
    for j in range(0,k+1):
      if i==0 and j==0:
        dp[i][j]=1
        break
      if j==0:
        dp[i][j]=1
        continue
      tmp=dp[i - 1][j] + dp[i][j - 1]
      if tmp>=mod:
        tmp%=mod
      dp[i][j]=tmp
      if j-a[i-1]-1>=0:
        tmp=dp[i][j]-dp[i-1][j-a[i-1]-1]
        if tmp>=mod:
          tmp%=mod
        dp[i][j]=tmp
    #print(dp)   
  print(dp[n][k])"""
main()
### BUGGY CODE ###

dx = [-1, -1, -1, 0, 1, 1, 1, 0]
dy = [1, 0, -1, -1, -1, 0, 1, 1]

# 0 裏 1 表
n, m = map(int, input().split())
count = 0
if n == 1 or m == 1:
    for i in range(n):
        for j in range(m):
            xy_count = 0
            for x, y in zip(dx, dy):
                if i + y == -1 or i + y == n or j + x == -1 or j + x == m:
                    continue
                # lis[i + y][j + x] = not lis[i + y][j + x]
                xy_count += 1
            if xy_count % 2 == 0:
                count += 1
    print(count)
else:
    print(n * m - (2 * n + 2 * m - 4))

### FIXED CODE ###

n, m = map(int, input().split())
print(abs(n * m - (2 * n + 2 * m - 4)))
### BUGGY CODE ###

from fractions import gcd

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

x = 1
ans = 0
for i in range(N):
    tmp = gcd(x, A[i])
    # ans += (i) * A[i] // tmp + A[i] * x //tmp  
    x = (x * A[i]) // tmp
    
b = 0
for i in range(N):
    b += x // A[i]
    
print(b%MOD)


### FIXED CODE ###

import fractions 
#from functools import reduce
import functools

MOD = 10**9+7


def main():
    # N = int(input())
    # A = list(map(int, input().split()))
    N, *A = map(int, open(0).read().split())
            
    x = 1
    for a in A:
        x *= a //  fractions.gcd(x, a)
        
    b = sum(x//a for a in A)
    print(b%MOD)
    
if __name__== "__main__":
    main()
### BUGGY CODE ###

import collections

def maxsushi(sushi_list,eaten_sushi):
    max_val = [0,0]
    for i in range(len(sushi_list)):
        if(sushi_list[i][1] not in eaten_sushi):
            tmp = sushi_list[i]
            max_val = sushi_list[i]
            break
    return max_val

N,K = map(int,input().split())
sushi = []
umasa = []
for _ in range(N):
    i,j = map(int,input().split())
    sushi.append(i)
    umasa.append(j)
l = list(zip(umasa,sushi))
l = sorted(l,reverse=True)
sushi_list = list(l)
eat_sushi = sushi_list[0:K]
eaten_sushi = set()
double_sushi = []
for i in range(K):
    if(sushi_list[i][1] not in eaten_sushi):
        eaten_sushi.add(sushi_list[i][1])
    else:
        double_sushi.append((sushi_list[i]))
manzoku = 0
sushi_list = sushi_list[K:N]
for i in range(len(eat_sushi)):
    manzoku += eat_sushi[i][0]
manzoku = manzoku + (len(eaten_sushi)) ** 2
tmp_manzoku = manzoku
flg = 0
while double_sushi:
    if(flg == 0):
        tmp1 = double_sushi.pop()
        max_val = [0,0]
        for i in range(len(sushi_list)):
            if(sushi_list[i][1] not in eaten_sushi):
                tmp = sushi_list[i]
                max_val = sushi_list[i]
                break
            flg = 1
    tmp2 = max_val
    if(tmp2[0] == 0 and tmp2[1] == 0):
        break
    eaten_sushi.add(tmp2[1])
    tmp_manzoku = tmp_manzoku + tmp2[0] - tmp1[0] + len(eaten_sushi) ** 2 - (len(eaten_sushi) - 1) ** 2
    if (tmp_manzoku > manzoku):
        manzoku = tmp_manzoku
print(manzoku)

### FIXED CODE ###

import collections

index = 0

def maxsushi(sushi_list,eaten_sushi):
    global index
    max_val = [0,0]
    for i in range(index,len(sushi_list)):
        if(sushi_list[i][1] not in eaten_sushi):
            tmp = sushi_list[i]
            max_val = sushi_list[i]
            index = i
            break
    return max_val

N,K = map(int,input().split())
sushi = []
umasa = []
for _ in range(N):
    i,j = map(int,input().split())
    sushi.append(i)
    umasa.append(j)
l = list(zip(umasa,sushi))
l = sorted(l,reverse=True)
sushi_list = list(l)
eat_sushi = sushi_list[0:K]
eaten_sushi = set()
double_sushi = []
for i in range(K):
    if(sushi_list[i][1] not in eaten_sushi):
        eaten_sushi.add(sushi_list[i][1])
    else:
        double_sushi.append((sushi_list[i]))
manzoku = 0
sushi_list = sushi_list[K:N]
for i in range(len(eat_sushi)):
    manzoku += eat_sushi[i][0]
manzoku = manzoku + (len(eaten_sushi)) ** 2
tmp_manzoku = manzoku 
while double_sushi:
    tmp1 = double_sushi.pop()
    tmp2 = maxsushi(sushi_list,eaten_sushi)
    if(tmp2[0] == 0 and tmp2[1] == 0):
        break
    eaten_sushi.add(tmp2[1])
    tmp_manzoku = tmp_manzoku + tmp2[0] - tmp1[0] + len(eaten_sushi) ** 2 - (len(eaten_sushi) - 1) ** 2
    if (tmp_manzoku > manzoku):
        manzoku = tmp_manzoku
print(manzoku)
### BUGGY CODE ###

import bisect
N = int(input())  # N<= 4000 6*10^10なので、削減しないとだめ
S = list(input())


# Si Sj Skがどれも別のもの。ただしi<j<k
# また、j-i != k-j
# 1,2,3はだめ1,2,4はok
# 1,3,5もだめ
# この組の数を求める

count = 0
for i in range(N):
    for j in range(i + 1, N):
        for k in range(j + 1, N):
            if j - i != k - j:
                if S[i] != S[j] and S[j] != S[k] and S[i] != S[k]:
                    count += 1


print(count)


### FIXED CODE ###

N = int(input())
S = input()
r = 0
g = 0
b = 0
for i in range(N):
    if S[i] == "R":
        r += 1
    elif S[i] == "G":
        g += 1
    else:
        b += 1
ans = r * g * b

for i in range(N - 2):
    for j in range(i + 1, N - 1):
        x = j + j - i
        if S[i] != S[j] and x <= N - 1:
            if S[i] != S[x] and S[x] != S[j]:
                ans -= 1

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

from collections import deque


h,w=map(int,input().split())
c=list(map(int,input().split()))
d=list(map(int,input().split()))
s=[list(input()) for _ in range(h)]


for y in range(h):
    s[y]=[10000000 if s[y][x]=="." else s[y][x] for x in range(w)]


s[c[0]-1][c[1]-1]=0
que=deque([[c[0]-1,c[1]-1]])
while que:
    y,x=que.popleft()
    for i,j in [(1,0),(0,1),(-1,0),(0,-1),(2,2),(2,1),(2,0),(2,-1),(2,-2),(1,2),(1,1),(1,-1),(1,-2),(0,2),(0,-2),(-1,2),(-1,1),(-1,-1),(-1,-2),(-2,2),(-2,1),(-2,0),(-2,-1),(-2,-2)]:
        if 0<=y+i<h and 0<=x+j<w:
            nexty,nextx=y+i,x+j
            dist=s[nexty][nextx]
            if dist!='#':
                if i*i+j*j==1:
                    if dist>s[y][x]:
                        s[nexty][nextx]=s[y][x]
                        que.append([nexty,nextx])
                elif dist>s[y][x]+1:
                    s[nexty][nextx]=s[y][x]+1
                    que.append([nexty,nextx])

if s[d[0]-1][d[1]-1]==10000000:
    print(-1)
else:
    print(s[d[0]-1][d[1]-1])


### FIXED CODE ###

from collections import deque
from sys import stdin

def bfs():
    readline=stdin.readline
    h,w=map(int,readline().split())
    sy,sx=map(int,readline().split())
    gy,gx=map(int,readline().split())
    sy-=1;sx-=1;gy-=1;gx-=1
    s=[list(readline()) for _ in range(h)]
    dict={".":10000000,"#":-1}
    s=[[dict[s[y][x]] for x in range(w)]for y in range(h)]
    s[sy][sx]=0
    que=deque([[sy,sx]])
    temp=[i for i in range(-2,3)]
    while que:
        y,x=que.popleft()
        s1=s[y][x]
        for i in temp:
            nexty=y+i
            if 0<=nexty<h:
                s2=s[nexty]
                for j in temp:
                    nextx=x+j
                    if 0<=nextx<w and s2[nextx]>=0:
                        dist=s2[nextx]
                        if i*i+j*j<=1 and dist>s1:
                            s[nexty][nextx]=s1
                            que.appendleft([nexty,nextx])
                        elif dist>s1+1:
                            s[nexty][nextx]=s1+1
                            que.append([nexty,nextx])

    if s[gy][gx]==10000000:
        print(-1)
    else:
        print(s[gy][gx])
bfs()
### BUGGY CODE ###

a,b,x=map(int,input().split())
c=0
for i in range(a,b+1):
  
  if i%x==0:
    c+=1
print(c)

### FIXED CODE ###

a,b,x=map(int,input().split())
if a<=b<x:
  if a==0:
    print(1)
  else:
    print(0)
else:
  s=(a-1)//x
  t=b//x
  print(t-s)
### BUGGY CODE ###

a,b=map(int,input().split())
t=min(a,b)
s=max(a,b)
c=1
i=2
while t > 1:
  frag=0
  while t%i ==0:
    t=t/i
    if frag==0 and s%i ==0:
      c=c+1
    frag=1
  if i==2:
    i=3
  else:
    i= i+2
print(c)

### FIXED CODE ###

a,b=map(int,input().split())
t=min(a,b)
t1=t
s=max(a,b)
c=1
i=2
while t > 1 and i <=int(t1**(0.5)+1):
  frag=0
  while t%i ==0:
    t=t/i
    if frag==0 and s%i ==0:
      c=c+1
    frag=1
  if i==2:
    i=3
  else:
    i= i+2
if s%t==0 and t > int(t1**(0.5)+1):
  c=c+1
print(c)
### BUGGY CODE ###

from collections import deque
H,W = map(int,input().split())
maze = []
for i in range(H):
    maze.append(input())
q = deque()
saitan = [1000000]*H*W
for i in range(H):
    for k in range(W):
        if maze[i][k] == '#':
            q.append(i*W+k)
            saitan[i*W+k] = 0

#print(start)
def bfs(h,w,q,Saitan):
    
    dx = [1,-1,0,0]
    dy = [0,0,1,-1]
    while len(q)>0 and (1000000 in saitan):
        j = q.popleft()
        y = int(j/w)
        x = j%w
        #print(saitan)
        for k in range(4):
            my = y + dy[k]
            mx = x + dx[k]
            #print(sx,sy,j,x,y,mx,my)
            if not((0 <=my <= h-1) and (0 <= mx <= w-1)):
                #print('q')
                continue
            if saitan[(my*w + mx)] != 1000000:
                #print('b')
                continue
            if saitan[(my*w + mx)] <= saitan[y*w + x] + 1:
                #print('c')
                continue
                
            saitan[(my*w + mx)] = saitan[y*w + x] + 1
            q.append(my*w + mx)
            #Sumi.append(my*w + mx)
    return max(saitan)

print(bfs(H,W,q,saitan))
#print(saitan)

### FIXED CODE ###

from collections import deque
H,W = map(int,input().split())
maze = []
for i in range(H):
    maze.append(input())
q = deque()
saitan = [1000000]*H*W
for i in range(H):
    for k in range(W):
        if maze[i][k] == '#':
            q.append(i*W+k)
            saitan[i*W+k] = 0
len_q = len(q)

#print(start)
def bfs(h,w,q,Saitan,len_Q):
    
    dx = [1,-1,0,0]
    dy = [0,0,1,-1]
    while len(q)>0 and len_Q < h * w:
        j = q.popleft()
        y = int(j/w)
        x = j%w
        #print(saitan)
        for k in range(4):
            my = y + dy[k]
            mx = x + dx[k]
            #print(sx,sy,j,x,y,mx,my)
            if not((0 <=my <= h-1) and (0 <= mx <= w-1)):
                #print('q')
                continue
            if saitan[(my*w + mx)] <= saitan[y*w + x] + 1:
                #print('c')
                continue
                
            saitan[(my*w + mx)] = saitan[y*w + x] + 1
            q.append(my*w + mx)
            len_Q += 1
            #Sumi.append(my*w + mx)
    return max(saitan)

print(bfs(H,W,q,saitan,len_q))
#print(saitan)
### BUGGY CODE ###

import sys
import math
from collections import deque
import copy

N, W = map(int, input().split())
wv = [list(map(int, input().split())) for _ in range(N)]

dp = [[-1 for _ in range(W + 1)] for _ in range(N + 1)]
for i in dp:
    i[0] = 0
dp[0] = [0 for _ in range(W + 1)]

for i in range(1, N + 1):
    for l in range(1, W + 1):
        if l - wv[i - 1][0] < 0:
            dp[i][l] = dp[i - 1][l]
        else:
            dp[i][l] = max(dp[i - 1][l], dp[i - 1][l - wv[i - 1][0]] + wv[i - 1][1])
print(dp[N][W])


### FIXED CODE ###

N, W = map(int, input().split())
wv = [list(map(int, input().split())) for _ in range(N)]

dp = [[-1 for _ in range(W + 1)] for _ in range(N + 1)]
for i in dp:
    i[0] = 0
dp[0] = [0 for _ in range(W + 1)]

for i in range(1, N + 1):
    for l in range(1, W + 1):
        if l - wv[i - 1][0] < 0:
            dp[i][l] = dp[i - 1][l]
        else:
            dp[i][l] = max(dp[i - 1][l], dp[i - 1][l - wv[i - 1][0]] + wv[i - 1][1])
print(dp[N][W])
### BUGGY CODE ###

list1=[2,3,5,7,11,13,17,19]
for i in range(20,100000):
    flag=0
    for j in range(3,318):
        if i%2==0:
            flag=1
            break
        elif i<j**2:
            break
        elif i%j==0:
            flag=1
            break
    #print(i,flag)
    if flag==0:
        list1.append(i)
#print(list1)

N=int(input())
for k in range(N):
    A=input()
    A=A.rstrip().split(" ")
    A1=int(A[0])
    A2=int(A[1])
#print(A1,A2)
    cnt=0
    for l in list1:
        if A1<= l <=A2 and (int((l+1)/2) in list1) :
            cnt+=1
    print(cnt)
    

### FIXED CODE ###

listS=[1]*100005
listS[0]=0
listS[1]=0
for i in range(2,100003):
    if listS[i]==1:
        for j in range(2*i,100000,i):
            listS[j]=0
list2017=[0]
for k in range(1,100001):
    if listS[k]==1 and listS[int((k+1)/2)]==1:
        list2017.append(list2017[k-1]+1)
    else:
        list2017.append(list2017[k-1])

N=int(input())
for x in range(N):
    l,m=map(int,input().split())
    print(list2017[m]-list2017[l-1])
### BUGGY CODE ###

n = int(input())

dlist = []

for i in range(n):
    arr = input().split()
    cmd = ''
    key = 0
    cmd = arr[0]
    if len(arr) > 1:
        key = arr[1]
    if cmd == 'insert':
        dlist.insert(0, key)
    elif cmd == 'delete':
        if dlist.count(key) > 0:
            idx = dlist.index(key)
            if idx != -1:
                dlist.pop(idx)
    elif cmd == 'deleteFirst':
        dlist.pop(0)
    elif cmd == 'deleteLast':
        dlist.pop(-1)

print(' '.join(dlist))



### FIXED CODE ###

from collections import deque

n = int(input())

dlist = deque()

for i in range(n):
    arr = input().split()
    cmd = ''
    key = 0
    cmd = arr[0]
    if len(arr) > 1:
        key = arr[1]
    if cmd == 'insert':
        dlist.appendleft(key)
    elif cmd == 'delete':
        try:
            dlist.remove(key)
        except:
            continue
    elif cmd == 'deleteFirst':
        dlist.popleft()
    elif cmd == 'deleteLast':
        dlist.pop()

print(' '.join(dlist))
### BUGGY CODE ###

import math
a, b, n = map(int, input().split())
n = min(n, b)
mem = {}
for x in range(1, n + 1):
    if mem.get(((a * x) % b, x % b)) is not None:
        break    
    else:
        mem[((a * x) % b, x % b)] = math.floor(a * x / b) - a * math.floor(x / b)
print(max(mem.values()))


### FIXED CODE ###

import math
a, b, n = map(int, input().split())

n = min(n, b-1)

print(math.floor(a * n / b) - a * math.floor(n / b))
### BUGGY CODE ###

n = int(input())
a = []
for i in range(0, n):
    a.append(int(input()))
for i in a:
    b = a.copy()
    b.remove(i)
    print(max(b))

### FIXED CODE ###

n = int(input())
a = []
for i in range(0, n):
    a.append(int(input()))
b = a.copy()
f = max(b)
b.remove(f)
s = max(b)

for i in a:
    r = f if i != f else s
    print(r)
### BUGGY CODE ###

import sys
input = sys.stdin.buffer.readline
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))

n, d, a = MAP()
xh = [LIST() for i in range(n)]

xh = sorted(xh, key=lambda x:(x[0]))
cnt = 0
for i in range(n):
    cx, ch = xh[i][0], xh[i][1]
    if ch <= 0:
        continue
    cn = (ch + a - 1) // a
    cnt += cn
    tmp = []
    j = i + 1
    while xh and j < len(xh):
        nx = xh[j][0]
        if nx <= cx + 2*d:
            xh[j][1] -= cn * a
            j += 1
        else:
            break
    
print(cnt)

### FIXED CODE ###

from collections import deque
import sys

input = sys.stdin.buffer.readline
def MAP(): return map(int, input().split())
def LIST(): return list(map(int, input().split()))

n, d, a = MAP()
xh = [LIST() for i in range(n)]

xh = sorted(xh, key=lambda x:(x[0]))
q = deque()
ca = 0
cnt = 0
for i in range(n):
    cx, ch = xh[i][0], xh[i][1]
    
    while q and q[0][0] < cx:
        qx, qa = q.popleft()
        ca -= qa
    
    if ch - ca <= 0:
        continue
    
    cn = (ch - ca + a - 1) // a
    cnt += cn
    ca += cn * a
    q.append([cx+2*d, cn*a])
    
print(cnt)
### BUGGY CODE ###

import sys
sys.setrecursionlimit(10 ** 7)

sr = lambda: sys.stdin.readline().rstrip()
ir = lambda: int(sr())
lr = lambda: list(map(int, sr().split()))

N = ir()
T = lr()
A = lr()
MOD = 10 ** 9 + 7

T_spe = [T[0]] + [0] * (N-1)
A_spe = [0] * (N-1) + [A[-1]]

for i in range(1, N):
    if T[i] > T[i-1]:
        T_spe[i] = T[i]

for i in range(N-2, -1, -1):
    if A[i] > A[i+1]:
        A_spe[i] = A[i]

answer = 1
for i in range(N):
    if T_spe[i] > A[i] or A_spe[i] > T[i]:
        print(0)
        exit()
    if T_spe[i] == 0 and A_spe[i] == 0:
        answer *= min(T[i], A[i])

print(answer%MOD)
# 34


### FIXED CODE ###

import sys
import numpy as np
sys.setrecursionlimit(10 ** 7)

sr = lambda: sys.stdin.readline().rstrip()
ir = lambda: int(sr())
lr = lambda: list(map(int, sr().split()))

N = ir()
T = np.array(lr()).astype('int64')
A = np.array(lr()).astype('int64')
MOD = 10 ** 9 + 7

T_low = T.copy()
T_low[1:][T[1:] <= T[:-1]] = 1
A_low = A.copy()
A_low[:-1][A[:-1] <= A[1:]] = 1

lower = np.maximum(T_low, A_low)
upper = np.minimum(T, A)
domain = np.maximum(0, upper - lower + 1) #変域が0の時は記録が間違い
L = len(domain); LSQ = int(L**.5 + 1)
domain = np.resize(domain, LSQ**2) #行列の形に無理やりする下準備（1次元）
domain[L:] = 1 #後半は全部1
domain = domain.reshape((LSQ, LSQ))
for n in range(1, LSQ):
    domain[:, n] *= domain[:, n-1]; domain[:, n] %= MOD
for n in range(1, LSQ):
    domain[n] *= domain[n-1, -1]; domain[n] %= MOD
answer = domain[-1, -1]
print(answer)
### BUGGY CODE ###

import sys
sys.setrecursionlimit(10 ** 5)
input = sys.stdin.readline
N, Z, W = [int(x) for x in input().strip().split()]
a = [int(x) for x in input().strip().split()]
d = {}
def minmax(x, y, c, f):
    # print('x={}, y={}, c={}, f={}'.format(x, y, c, f))
    if (x, y, c, f) in d:
        return d[(x, y, c, f)]
    if c == N:
        return abs(x - y)
    if f == 0:
        ret = -float('inf')
        for i in range(1, N - c + 1):
            ret = max(ret, minmax(a[c+i-1], y, c+i, f^1))
    else:
        ret = float('inf')
        for i in range(1, N - c + 1):
            ret = min(ret, minmax(x, a[c+i-1], c+i, f^1))
    d[(x, y, c, f)] = ret
    return ret

print(minmax(Z, W, 0, 0))

### FIXED CODE ###

import sys
sys.setrecursionlimit(10 ** 5)
input = sys.stdin.readline
N, Z, W = [int(x) for x in input().strip().split()]
a = [int(x) for x in input().strip().split()]
d = {}
def minmax(x, y, c, f):
    # print('x={}, y={}, c={}, f={}'.format(x, y, c, f))
    if (c, f) in d:
        return d[(c, f)]
    if c == N:
        return abs(x - y)
    if f == 0:
        ret = -float('inf')
        for i in range(1, N - c + 1):
            ret = max(ret, minmax(a[c+i-1], y, c+i, f^1))
    else:
        ret = float('inf')
        for i in range(1, N - c + 1):
            ret = min(ret, minmax(x, a[c+i-1], c+i, f^1))
    d[(c, f)] = ret
    return ret

print(minmax(Z, W, 0, 0))