N=int(input())
A=list(map(int,input().split()))
B=list(map(int,input().split()))
cnt=1
ans=0
for i in range(N-1):
    if A[i]+max(B[i],B[i+1])<A[i+1]+min(B[i],B[i+1]):
        cnt+=1
    else:
        ans+=(cnt*(cnt-1))//2
        cnt=1
print(ans+cnt*(cnt-1)//2)