N=int(input())
A=list(map(int,input().split()))
B=list(map(int,input().split()))
ANS=0


now=0
for i in range(N-1):
    if A[i+1]-A[i]>abs(B[i+1]-B[i]):
        now+=1
    else:
        ANS+=now*(now+1)//2
        now=0
ANS+=now*(now+1)//2

print(ANS)