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

from collections import defaultdict
from heapq import heappush, heappop
N = int(input())
dic = defaultdict(list)
toNum = {}
L = N*(N-1)//2
s = [0]
for i in range(N-1,0,-1):
  s += [s[-1]+i]
used = [True]*L
for i in range(N):
  inf = [int(c)-1 for c in input().split()]
  pa = min(i,inf[0])
  pb = max(i,inf[0])
  pnum = s[pa]+(pb-pa-1)
  for j in range(1,N-1):
    a = min(i,inf[j])
    b = max(i,inf[j])
    num = s[a]+(b-a-1)
    used[num] = False
    dic[pnum]  += [num]
    pa = a
    pb = b
    pnum = num

hq = []
dist = [0]*L
for i in range(L):
  if used[i]:
    heappush(hq,(1,i))
if hq==[]:
  print(-1)
  import sys
  sys.exit()
cnt = 0
ans = 0
while hq:
  c, n = heappop(hq)
  if dist[n]>=c:
    continue
  dist[n] = c
  cnt += 1
  for m in dic[n]:
    if dist[m]>=c+1:
      continue
    if ans<c+1:
      ans = c+1
    heappush(hq,(c+1,m))
  if ans>L:
    print(-1)
    break
else:
  print(ans)

### FIXED CODE ###

N = int(input())
es = [[] for i in range(N)]
cand = set()
for i in range(N):
  es[i] = [int(i)-1 for i in input().split()][::-1]
def check(i):
  if es[i]==[]:
    return
  j = es[i][-1]
  if es[j]==[]:
    return
  if es[j][-1]==i:
    cand.add(i)
    cand.add(j)

for i in range(N):
  check(i)
day = 0
while cand:
  day += 1
  precand = cand.copy()
  cand = set()
  for i in precand:
    x = es[i].pop()
  for i in precand:
    check(i)
for i in range(N):
  if len(es[i])!=0:
    print(-1)
    break
else:
  print(day)
### BUGGY CODE ###

N,H = map(int,input().split())

A = []
B = []
for i in range(N):
    a,b=map(int,input().split())
    A.append(a)
    B.append(b)

A.sort(reverse=True)
B.sort(reverse=True)
ans = 0
tmp = 0
while(1):
    if tmp>=H:
        print(ans)
        exit()
    if len(B)==0:
        break
    if A[0]>=B[0]:
        break
    tmp += B[0]
    ans += 1
    del B[0]

res = H - tmp
if res%A[0]==0:
    ans += res//A[0]
else:
    ans += res//A[0]
    ans += 1 
print(ans)

### FIXED CODE ###

N,H=map(int,input().split())
a=[]
b=[]
for i in range(N):
    c,d=map(int,input().split())
    a.append(c)
    b.append(d)

a.sort(reverse=True)
at=a[0]
b.sort(reverse=True)
ans=0
for i in range(N):
    if at<b[i]:
        H-=b[i]
        ans+=1
    if H<=0:
        break
if H<=0:
    print(ans)
    exit()
ans+=(H+at-1)//at
print(max(ans,1))
### BUGGY CODE ###

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

a = []
ans = 0

for i in range(N):
  a.append(P[i])
  if min(a) >= P[i]:
    ans += 1
    
print(ans)

### FIXED CODE ###

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

a = P[0]
ans = 0

for i in range(N):
  if P[i] <= a:
    a = P[i]
    ans += 1
    
print(ans)
### BUGGY CODE ###

# -*- coding: utf-8 -*-
def compare(x):
  return x[0]


def find(x, lst):
  for value in lst:
    if value[0] == x:
      return True
  return False


n = int(input())
lst = [[0, 0, 0]]
for i in range(n):
  lst.append(list(map(int, input().split())))
lst.sort(key=compare)
x = lst[len(lst) - 1][0]
for i in range(1, x):
  if not find(i, lst):
    lst.append([i, -1, -1])
lst.sort(key=compare)

points = [[0, 0]]
flg = False
try:
  for i in range(1, x + 1):
    fix = False
    wk = []
    for point in points:
      wk.append((point[0] + 1, point[1]))
      wk.append((point[0] - 1, point[1]))
      wk.append((point[0], point[1] + 1))
      wk.append((point[0], point[1] - 1))
      wk = list(set(wk))

      ps = (lst[i][1], lst[i][2])
      x = point[0]
      y = point[1]
      if (i == lst[i][0]) and (x >= 0) and (y >= 0) and ((x + 1, y) == ps or (x - 1, y) == ps or (x, y + 1) == ps or (x, y - 1) == ps):
        flg = True
        wk = [ps]
        break
    points = list(set(wk))
    if (i == lst[i][0]) and (lst[i][1] >= 0) and (not flg):
      break
finally:
  print('Yes') if flg else print('No')


### FIXED CODE ###

# -*- coding: utf-8 -*-
n = int(input())
points = []
for i in range(n):
  points.append(list(map(int, input().split())))

flg = False
for point in points:
  flg = (point[0] >= (point[1] + point[2])) and ((point[0] % 2 == 1) and ((point[1] + point[2]) % 2 == 1) or (point[0] % 2 == 0) and ((point[1] + point[2]) % 2 == 0))
  if not flg:
    break
print('Yes') if flg else print('No')
### BUGGY CODE ###

N=int(input())
S=list(map(int,input().split( )))
tri=[]
for i in range(N-2):
    for j in range(i+1,N-1):
        for k in range(j+1,N):
            a = [S[i],S[j],S[k]]
            a = sorted(a)
            if a[0] + a[1] > a[2]:
                tri.append(a)

print(len(tri))

### FIXED CODE ###

N=int(input())
S=list(map(int,input().split( )))
S = sorted(S)
tri_num=0
for i in range(N-2):
    k = i+2
    for j in range(i+1,N-1):
        while k < N:
            if S[i] + S[j] <= S[k]:
                tri_num = tri_num + k-j-1
                if k == i+2:
                    k+=1
                break
            if k == N-1:
                tri_num = tri_num + k-j
                break
            k+=1
print(tri_num)
### BUGGY CODE ###

import sys
from itertools import combinations
input = sys.stdin.readline
n = int(input())
a = [int(x) for x in input().strip().split()]
b = [int(x) for x in input().strip().split()]

all_cards = []
for i, (aa, bb) in enumerate(zip(a, b)):
    all_cards.append((aa, bb, i))

def check(cards):
    pre = -1
    for c in cards:
        print(c)
        if c[0] >= pre:
            pre = c[0]
        else:
            return False
    else:
        return True

def cnt(l):
    ret = 0
    for i in range(len(l)-1):
        for j in range(i+1, len(l)):
            if l[i] > l[j]:
                ret += 1
    return ret

dic = {}
def dp(all_cards, l, p):
    i = len(l) + 1
    if len(l) == n:
        return cnt(l)
    ret = float('inf')
    for card in all_cards:
        if card[2] in l:
            continue
        if card[(i-(card[2]+1))%2] >= p:
            ret = min(ret, dp(all_cards, l+[card[2]], card[(i-(card[2]+1))%2]))
    dic[tuple(l)] = ret
    return ret

ans = dp(all_cards, [], -float('inf'))
if ans == float('inf'):
    ans = -1
print(ans)

### FIXED CODE ###

import sys
from itertools import combinations
input = sys.stdin.readline
n = int(input())
a = [int(x) for x in input().strip().split()]
b = [int(x) for x in input().strip().split()]

all_cards = []
for i, (aa, bb) in enumerate(zip(a, b)):
    if i % 2:
        aa, bb = bb, aa
    all_cards.append([aa, bb, i])

def cnt(l):
    ret = 0
    for i in range(len(l)-1):
        for j in range(i+1, len(l)):
            if l[i][1] > l[j][1]:
                ret += 1
    return ret

ans = float('inf')
for cards in combinations(all_cards, (n + 1)// 2):
    acards = []
    for card in cards:
        acards.append([card[0],card[2]])
    bcards = []
    for card in all_cards:
        if [card[0],card[2]] not in acards:
            bcards.append([card[1],card[2]])

    acards.sort()
    bcards.sort()
    abcards = []
    # print(acards, bcards)
    for i in range(len(bcards)):
        abcards.extend([acards[i], bcards[i]])
    else:
        if n % 2:
            abcards.append(acards[-1])
    # print(abcards)
    if abcards != sorted(abcards, key=lambda x: x[0]):
        continue
    ans = min(ans, cnt(abcards))

if ans == float('inf'):
    ans = -1
print(ans)
### BUGGY CODE ###

x = int(input())
for i in range(x):
    for j in range(-x,0):
        if i**5-j**5 == x:
            print(i,j)
            quit()

### FIXED CODE ###

x = int(input())
for i in range(-118,120):
    for j in range(-118,119):
        if i**5-j**5 == x:
            print(i,j)
            quit()
### BUGGY CODE ###

#coding:utf-8
#1_9_C
import queue

q = queue.PriorityQueue()
while True:
    cmd = input().split()
    if cmd[0] == "end":
        break
    elif cmd[0] == "insert":
        q.put(-int(cmd[1]))
    else:
        print(-q.get())

### FIXED CODE ###

#coding:utf-8
#1_9_C
import heapq

h = []
while True:
    cmd = input().split()
    if cmd[0] == "end":
        break
    elif cmd[0] == "insert":
        heapq.heappush(h, -int(cmd[1]))
    else:
        print(-heapq.heappop(h))
### BUGGY CODE ###

S = input()
N = len(S)
CNT = [0]*2019
CNT[0] = 1
num = 0
for i in range(N):
    num = num * 10 + int(S[i]) 
    CNT[num * pow(10, N-i)%2019] += 1
ans = 0
for cnt in CNT:
    if cnt==0: continue
    ans += (cnt*(cnt - 1)) // 2
print(ans)

### FIXED CODE ###

S = list(map(int, list(input())))[::-1]
N = len(S)
CNT = [0]*2019
CNT[0] = 1
num = 0
d = 0
for i in range(N):
    num += S[i]*pow(10, d, 2019)
    num %= 2019
    CNT[num] += 1
    d += 1
ans = 0 
for cnt in CNT:
    ans += (cnt*(cnt - 1)) // 2
print(ans)
### BUGGY CODE ###

n,k = [int(i) for i in input().split()]
arr = [int(i) for i in input().split()]

dif = lambda x,y: abs(x-y)

dp = [0]*n

for i in range(1,n):
    H = arr[i]
    dp[i] = min([dp[j]+dif(arr[j],H) for j in range(max(0,i-k),i)])

print(dp[-1])


### FIXED CODE ###

ni,ki = [int(i) for i in input().split()]
arri = [int(i) for i in input().split()]
    
def getRes(arr,n,k):
    dp = [0]*n
    for i in range(1,n):
        H = arr[i]
        dp[i] = min([dp[j]+abs(arr[j]-H) for j in range(max(0,i-k),i)])
    return dp[-1]

print(getRes(arri,ni,ki))
### BUGGY CODE ###

H, W = map(int, input().split(" "))
S = [input() for _ in range(H)]

l, r, d, u = [[[0 for _ in range(W)] for _ in range(H)] for _ in range(4)]

for y in range(H):
    for x in range(W):
        if S[y][x] == "#":
            l[y][x] = -1
        elif x == 0:
            l[y][x] = 0
        else:
            l[y][x] = l[y][x-1] + 1
for y in range(H):
    for x in range(W-1, -1, -1):
        if S[y][x] == "#":
            r[y][x] = -1
        elif x == W-1:
            r[y][x] = 0
        else:
            r[y][x] = r[y][x+1] + 1
for x in range(W):
    for y in range(H):
        if S[y][x] == "#":
            u[y][x] = -1
        elif y == 0:
            u[y][x] = 0
        else:
            u[y][x] = u[y-1][x] + 1
for x in range(W):
    for y in range(H-1, -1, -1):
        if S[y][x] == "#":
            d[y][x] = -1
        elif y == H-1:
            d[y][x] = 0
        else:
            d[y][x] = d[y+1][x] + 1

max_num = 0
for y in range(H):
    for x in range(W):
        m = l[y][x] + r[y][x] + u[y][x] + d[y][x] + 1
        # if m > max_num:
        #     print(x, y, l[y][x], r[y][x], u[y][x], d[y][x], m)
        max_num = max(max_num, m)

print(max_num)

### FIXED CODE ###

H, W = map(int, input().split(" "))
S = [input() for _ in range(H)]

l, r, d, u = [[[0 for _ in range(W)] for _ in range(H)] for _ in range(4)]

for y in range(H):
    for x in range(W):
        if S[y][x] == "#":
            l[y][x] = -1
        elif x == 0:
            l[y][x] = 0
        else:
            l[y][x] = l[y][x-1] + 1
for y in range(H):
    for x in range(W-1, -1, -1):
        if S[y][x] == "#":
            r[y][x] = -1
        elif x == W-1:
            r[y][x] = 0
        else:
            r[y][x] = r[y][x+1] + 1
for x in range(W):
    for y in range(H):
        if S[y][x] == "#":
            u[y][x] = -1
        elif y == 0:
            u[y][x] = 0
        else:
            u[y][x] = u[y-1][x] + 1
for x in range(W):
    for y in range(H-1, -1, -1):
        if S[y][x] == "#":
            d[y][x] = -1
        elif y == H-1:
            d[y][x] = 0
        else:
            d[y][x] = d[y+1][x] + 1

max_num = 0
for y in range(H):
    for x in range(W):
        m = l[y][x] + r[y][x] + u[y][x] + d[y][x] + 1
        # if m > max_num:
        #     print(x, y, l[y][x], r[y][x], u[y][x], d[y][x], m)
        max_num = max(max_num, m)

print(max_num)
### BUGGY CODE ###

N=int(input())
A=[ai for ai in map(int,input().split())]
CA={}
for a in A:
    if a in CA:
        CA[a]+=1
    else:
        CA[a]=1

for i in range(1,N):
    CA_Tmp={ai:0 for ai in CA.keys()}
    CA_Tmp[A[0]]=1
    CA_Tmp[A[i]]=1
    crnt=A[i]
    next=A[0]^A[i]
    Ans=True
    for j in range(2, N):
        if next in CA:
            CA_Tmp[next]+=1
            if CA_Tmp[next] > CA[next]:
                Ans=False
                break
            crnt,next=next,crnt^next
        else:
            Ans=False
            break
    if Ans==True:
        if next!=A[0]:
            Ans=False
        else:
            break

print("Yes" if Ans==True else "No")


### FIXED CODE ###


import collections as col
N=int(input())
A=[ai for ai in map(int,input().split())]
Ans=False
CA=col.Counter(A)
if len(CA)==1 and 0 in CA:
    Ans=True
elif len(A)%3==0:
    if len(CA)==3:
        K=list(CA.keys())
        if (K[0]^K[1]==K[2]) and (CA[K[0]]==CA[K[1]]==CA[K[2]]):
            Ans=True
    elif len(CA)==2:
        K=list(sorted(CA.keys()))
        if CA[K[0]]*2==CA[K[1]]:
            Ans=True

print("Yes" if Ans==True else "No")
### BUGGY CODE ###

def main():
    n = int(input())
    a = [int(x) for x in input().split()]
    a_s = sorted(set(a), key=a.index)
    cnt = 0
    order = 1
    if not 1 in a_s:
        print(-1)
        exit()
    else:
        for i in range(len(a)):
            if a[i] != order:
                cnt += 1
            if a[i] == order:
                order += 1
    print(cnt)

if __name__ == '__main__':
    main()


### FIXED CODE ###

def main():
    n = int(input())
    a = [int(x) for x in input().split()]
    a_s = set(a)
    cnt = 0
    order = 1
    if not 1 in a_s:
        print(-1)
        exit()
    else:
        for i in range(len(a)):
            if a[i] != order:
                cnt += 1
            if a[i] == order:
                order += 1
    print(cnt)

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

N,K,Q = map(int,input().split(" "))
#正解者のリスト、正解順
a=[]
#番号：正解数
a2={}

for i in range(Q):
  a.append(input())
  
#参加者の得点リスト、順番に並んでる
b = []

for i in range(N):
  b.append(0)

  
for i in range(N):
  a2[i+1] = a.count(str(i+1))

for i in range(N):
  if a2[i+1] >= Q-K+1:
    print("Yes")
  else:
    print("No")

### FIXED CODE ###

N,K,Q = map(int,input().split(" "))
a2={}
for i in range(Q):
  j = input()
  if j not in a2:
    a2[j] = 1
  else:
    a2[j] += 1
    
for i in range(N):
  if str(i+1) not in a2:
    a2[str(i+1)] = 0
  if a2[str(i+1)] >= Q-K+1:
    print("Yes")
  else:
    print("No")
### BUGGY CODE ###

n = int(input())

ans_li = [i for i in range(1,n)]
print(sum(ans_li))

### FIXED CODE ###

n = int(input())

ans=0
if (n-1)%2==0:
    ans+=n*((n-1)//2)
else:
    ans+=n*((n-1)//2)+n//2
print(ans)
### BUGGY CODE ###

from collections import Counter
from functools import reduce
# import statistics
import bisect
import copy
import fractions
import math
import pprint
import random
import sys
import time
sys.setrecursionlimit(10**7)
INF = 10 ** 18
MOD = 10 ** 9 + 7
def LI(): return [int(x) 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 MI(): return map(int, sys.stdin.readline().split())
def II(): return int(sys.stdin.readline())
def IS(): return input()
def C(x): return Counter(x)
def GCD_LIST(numbers):
    return reduce(fractions.gcd, numbers)
def LCM_LIST(numbers):
    return reduce(LCM, numbers)
def LCM(m, n):
    return (m * n // fractions.gcd(m, n))
def unite(x, y):
    # それぞれのノードの根を求める
    x = root(x)
    y = root(y)
    if x == y:
        return
    # node[x]の根をyに変更する
    node[x] = y
def same(x,y): return bool(root(x) == root(y))
def root(x):
    if node[x] == x:  # xが根の場合
        return x
    else:
        node[x] = root(node[x])  # 経路圧縮
        return node[x]
def dfs(v,depth):
    # ノードに訪れた
    visited[v] = 1
    if depth == 2:
        return
    for a, b in sides:
        if v == a-1:
            depth += 1
            dfs(b-1, depth)
            depth -= 1

n, m = MI()
sides = [LI() for _ in range(m)]
visited = [0] * n
dfs(0,0)
print('POSSIBLE') if visited[n-1] == 1 else print('IMPOSSIBLE')


### FIXED CODE ###

from collections import Counter
from functools import reduce
# import statistics
import bisect
import copy
import fractions
import math
import pprint
import random
import sys
import time
sys.setrecursionlimit(10**7)
INF = 10 ** 18
MOD = 10 ** 9 + 7
def LI(): return [int(x) 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 MI(): return map(int, sys.stdin.readline().split())
def II(): return int(sys.stdin.readline())
def IS(): return input()
def C(x): return Counter(x)
def GCD_LIST(numbers):
    return reduce(fractions.gcd, numbers)
def LCM_LIST(numbers):
    return reduce(LCM, numbers)
def LCM(m, n):
    return (m * n // fractions.gcd(m, n))
def unite(x, y):
    # それぞれのノードの根を求める
    x = root(x)
    y = root(y)
    if x == y:
        return
    # node[x]の根をyに変更する
    node[x] = y
def same(x,y): return bool(root(x) == root(y))
def root(x):
    if node[x] == x:  # xが根の場合
        return x
    else:
        node[x] = root(node[x])  # 経路圧縮
        return node[x]
def dfs(v,depth):
    # ノードに訪れた
    visited[v] = 1
    if depth == 2:
        return
    for a, b in sides:
        if v == a-1:
            depth += 1
            dfs(b-1, depth)
            depth -= 1

n, m = MI()
sides = [LI() for _ in range(m)]
islands = [[0] * 2 for _ in range(n)]

for a, b in sides:
    if a-1 == 0:
        islands[b-1][0] = 1
    if b-1 == n-1:
        islands[a-1][1] = 1

for a, b in islands:
    if a == b == 1:
        print('POSSIBLE')
        exit()
print('IMPOSSIBLE')
### BUGGY CODE ###

X, Y, Z, K = map(int, input().split())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))
AB = [a + b for a in A for b in B]
AB.sort(reverse=True)
AB = AB[:K]
ABC = [ab + c for ab in AB for c in C]
ABC.sort(reverse=True)
for k in range(K):
    print(ABC[k])


### FIXED CODE ###

X, Y, Z, K = map(int, input().split())
*A, = sorted(map(int, input().split()), reverse=True)
*B, = sorted(map(int, input().split()), reverse=True)
*C, = sorted(map(int, input().split()), reverse=True)
AB = [A[x] + B[y] for y in range(Y) for x in range(X)]
AB.sort(reverse=True)
AB = AB[:K]
ABC = [AB[x] + C[z] for z in range(Z) for x in range(len(AB))]
ABC.sort(reverse=True)
for k in range(K):
    print(ABC[k])
### BUGGY CODE ###

N = int(input())
S_list = [input() for i in range(N)]
count = 0
while len(S_list) > 0:
    S_list = [s for s in S_list if s != S_list[0]]
    count += 1
print(count)


### FIXED CODE ###

import collections

N = int(input())
S_list = [input() for i in range(N)]
c = collections.Counter(S_list)
print(len(c))
### BUGGY CODE ###

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


input()
l = list(map(lambda x: int(x), str(input()).split(" ")))
r = 1
for i in l:
    r = r * i
if r > 10 ** 18:
    print(str(-1))
else:
    print(str(r))


### FIXED CODE ###

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

input()
l = list(map(lambda x: int(x), str(input()).split(" ")))
r = 1
finished = False

for i in l:
  if i == 0:
    print(str(0))
    sys.exit()
    
for i in l:
    r = r * i
    if r > 10 ** 18:
        print(str(-1))
        sys.exit()

print(str(r))
### BUGGY CODE ###

import sys
sys.setrecursionlimit(10**8)

N, M = map(int, input().split(" "))
AB = [list(map(int, input().split(" "))) for _ in range(M)]


class UnionFind:
    def __init__(self, n):
        self.n = n
        self.per = list(range(n))
        self.point = n*(n-1) // 2
        self.counts = [1]*n

    def root(self, x):
        while self.per[x] != x:
            x = self.per[x]
        return x
        # if self.per[x] == x:
        #     return x
        # return self.root(self.per[x])

    def union(self, x, y):
        rx = self.root(x)
        ry = self.root(y)
        if rx == ry:
            return False
        self.per[rx] = ry
        self.point -= self.counts[ry] * self.counts[rx]
        self.counts[ry] += self.counts[rx]
        self.counts[rx] = 0

    def is_same(self, x, y):
        rx = self.root(x)
        ry = self.root(y)
        return rx == ry


u = UnionFind(N)
results = []
for a, b in AB[::-1]:
    results.append(u.point)
    x, y = a-1, b-1
    u.union(x, y)

# print(*results[::-1])
for r in results[::-1]:
    print(r)


### FIXED CODE ###

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


class UnionFind:
    def __init__(self, n):
        self.par = [-1]*n
        self.size = [1]*n
        self.point = n*(n-1) // 2

    def root(self, x):
        if self.par[x] < 0:
            return x
        self.par[x] = self.root(self.par[x])
        return self.par[x]

    def unite(self, x, y):
        rx = self.root(x)
        ry = self.root(y)
        if rx == ry:
            return False
        if self.size[rx] < self.size[ry]:
            rx, ry = ry, rx
        self.point -= self.size[rx]*self.size[ry]
        self.size[rx] += self.size[ry]
        self.par[ry] = rx
        return True

    def is_same(self, x, y):
        rx, ry = self.root(x), self.root(y)
        return rx == ry

    def get_size(self, x):
        return self.size[self.root(x)]


uf = UnionFind(N)
results = []
for a, b in AB[::-1]:
    results.append(uf.point)
    x, y = a-1, b-1
    uf.unite(x, y)

print(*results[::-1], sep="\n")
### BUGGY CODE ###

n = int(input())
t = list(map(int, input().split(' ')))
a = list(map(int, input().split(' ')))
result = 1
for i in range(n):
    h_max, h_min = min(t[i], a[i])+1, 1

    if i != 0:
        if t[i-1] < t[i]:
            h_min = t[i]
    else:
        h_min = t[0]

    if i != n-1:
        if a[i] > a[i+1]:
            h_min = a[i]
    else:
        h_min = max(a[n-1], h_min)


    result = result * max(h_max - h_min, 0)
print(result % (10**9+7))

### FIXED CODE ###

n = int(input())
t = list(map(int, input().split(' ')))
a = list(map(int, input().split(' ')))
result = 1
for i in range(n):
    h_max, h_min = min(t[i], a[i])+1, 1

    if i != n-1:
        if a[i] > a[i+1]:
            h_min = a[i]
    else:
        h_min = a[n-1] 

    if i != 0:
        if t[i-1] < t[i]:
            h_min = t[i]
    else:
        h_min = t[0]


    result = result * max(h_max - h_min, 0) % (10**9+7)
print(result)