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

X=0
i=0
while i<N:
    j=i+1
    while j<N and A[j]-A[j-1]>abs(B[j]-B[j-1]):
        j+=1
    d=j-i
    X+=d*(d-1)//2
    i=j

print(X)