#include <bits/stdc++.h>

using namespace std;

#define rep(i, a, b) for(int i = a;i < (b);++i)
#define sz(x) (int)(x).size()
typedef vector<int> vi;

#define int long long

int calculatePref(int N) {
    int sum = 0;
    int sq = sqrt(N);
    //cout << sq << endl;

    if (N == 1) {
        return 1;
    }
    for (int i = 1;i * i <= N;i++) {
        sum += (N / i - i) * 2;
        sum++;

    }
    //cout << sum << endl;
    return sum;
}

main() {
    ios_base::sync_with_stdio(0);
    int N,M;
    cin >> N >> M;
    cout << calculatePref(M) - calculatePref(N - 1) << endl;
    return 0;
}