from numpy  import sqrt

def osztok(x):
	res = 0
	i=1
	while i*i<x:
		res += x//i - i
		i+=1
	return 2*res+int(sqrt(x));


	
#for i in range(21):
#	print(i, osztok(i))

n,m = list(map(int, input().split()))



print(osztok(m)-osztok(n-1))