#include <iostream>
#include <string>
#include <cstdio>
#include <cstdlib>
#include <set>
#include <map>
#include <vector>
#include <cmath>

using namespace std;
typedef long long LL;

LL osztok(LL x) {
	LL res = 0;
	for (LL i = 1; i*i<x; i++){
		res += x/i - (i);
	}
	return 2*res+sqrt(x);
	
}

int main() {
	LL n,m;
	scanf("%lld %lld", &n, &m);
	
	printf("%lld\n", osztok(m)-osztok(n-1));
	
	/*for (LL i = 0; i < 20; i++){
		cout<<i<<" "<<osztok(i)<<endl;
	}*/
	
	
	return 0;
}