#include <bits/stdc++.h>
#define rep(i,a,b) for (int i=a; i<b; i++)
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
#define debug printf
using namespace std;
typedef pair <int, int> PII;
typedef vector <int> VI;
typedef long long LL;
typedef long double ld;

const LL MN = 1000003;

LL daj(LL a, LL b)
{
	a = max(a, (LL)(MN + 1LL));
	return max(0LL, b - a + 1LL);
}

LL suma(LL a)
{
	LL ret = 0LL;
	for(LL i = 1LL; i <= MN; ++i)
	{
		ret += (a / i);
		ret += (daj(1LL, (a / i)) - daj(1LL, (a / (i + 1LL)))) * i;
	}
	return ret;
}

int main ()
{
	LL N, M;
	scanf("%lld%lld", &N, &M);
	printf("%lld", suma(M) - suma(N - 1LL));
	
}