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

X=0
r=0
for l in range(N):
    r=max(r,l+1)

    while r<N and A[r]-A[l]>abs(B[r]-B[l]):
        r+=1

    X+=r-l-1

print(X)