import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#######################################################################
n = ni()
a = na()
b = na()
c = [0]*(n-1)
for i in range(n-1):
    if a[i]+b[i+1] < a[i+1]+b[i]:
        c[i] = 1

r = []
x = 0
for i in range(n-1):
    if c[i]:
        x += 1
    else:
        r.append(x)
        x = 0
r.append(x)
ans = 0
for i in r:
    ans += i * (i+1)//2
print(ans)