n = int(input())
a = list(map(int, input().split()))
b = list(map(int, input().split()))
cnt = ans = 0
for i in range(n-1):
    if a[i]+max(b[i:i+2]) < a[i+1]+min(b[i:i+2]): cnt += 1
    else: ans += cnt*(cnt+1)//2; cnt = 0 
print(ans+cnt*(cnt+1)//2)