n=int(input())
a=list(map(int,input().split()))
b=list(map(int,input().split()))
c=[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]):
		c+=[i+1]
c+=[n]
a=0
for i in range(len(c)-1):
	w=c[i+1]-c[i]+1
	a+=w*(w-1)//2-(w-1)
print(a)