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

//xの約数の総和を求める
//O(√N)
long long f(int x, int M) {
    long long ret = 0;
    for (int d = 1; d * d <= x; d++) {
        if (x%d) continue;
        if (d <= M) ret += d;
        if (x != d * d && x/d <= M) ret += x/d;
    }
    return ret;
}

int main() {
    //O(N√N)解法
    int N, M; cin >> N >> M;

    vector<long long> S(N+1);
    S[0] = 0;
    //S[i] = S[i-1] + Plus[i]
    vector<long long> Plus(N+1, M);
    
    for (int i = 1; i <= N; i++) {
        Plus[i] -= f(i, M);
    }

    for (int i = 1; i <= N; i++) S[i] = S[i-1] + Plus[i];

    long long ans = 0;
    for (int i = 1; i <= N; i++) ans = max(ans, S[i]);
    cout << ans << endl;
}