#include <bits/stdc++.h>
#define int long long
using namespace std;
ifstream fin ("ndiv.in");
ofstream fout ("ndiv.out");
int ans , a , b;
int solve (int x)
{
    int p = 0 , d = 3 , ans = 1;
    while (x % 2 == 0) x = x / 2 , p++;
    ans = ans * (p + 1);
    while (x > 1)
    {
        p = 0;
        while (x % d == 0) x = x / d , p++;
        if (p) ans = ans * (p + 1);
        d = d + 2;
        if (d * d > x && x > 1) d = x;
    }
    return ans;
}
signed main()
{
    fin >> a >> b;
    for (int i=a; i<=b; i++) ans = ans + solve(i);
    fout << ans;
}