import sys
input = sys.stdin.readline
from collections import *

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
cnt = 0
ans = 0

for i in range(N-1):
    if A[i+1]-A[i]>abs(B[i+1]-B[i]):
        cnt += 1
    else:
        ans += cnt*(cnt+1)//2
        cnt = 0

ans += cnt*(cnt+1)//2
print(ans)