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

ans=0
C = []
for i in range(N-1):
    if A[i]+max(B[i],B[i+1])<A[i+1]+min(B[i],B[i+1]):
        C.append(1)
    else:
        C.append(0)

left=0
#print(C)
while left<=N-2:
    count=0
    if C[left]==0:
        left+=1
        continue
    for right in range(left,N-1):
        if C[right]==1:
            count+=1
        else:
            break
    left+=count
    ans+=(count+1)*count//2
print(ans)