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

X=0
l=r=0
while l<N:
    r=l+1
    while r<N:
        if A[r]-A[l]>abs(B[r]-B[l]):
            r+=1
        else:
            break

    d=r-l
    X+=d*(d-1)//2

    l=r

print(X)