#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

int main() {
    
    ll n, m;
    cin >> n >> m;
    
    ll result = (m - n) + 1;
    for (ll i = 1; i <= 1000000; i++) {
        result += m / i - (n - 1) / i;
        if (i >= n && i <= m) result--;
    }
    cout << result << endl;
    return 0;
}