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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int N, W;
    cin >> N >> W;

    const int MAXX = 200000;
    vector<long long> by_weight(MAXX + 1, 0);

    for (int i = 0; i < N; i++) {
        int X;
        long long Y;
        cin >> X >> Y;
        by_weight[X] += Y;
    }

    long long ans = 0;

    for (int g = W; g <= MAXX; g++) {
        long long cur = 0;
        for (int multiple = g; multiple <= MAXX; multiple += g) {
            cur += by_weight[multiple];
        }
        ans = max(ans, cur);
    }

    cout << ans << '\n';
    return 0;
}