#include <iostream>
#include <vector>
#include <fstream>
#include <algorithm>

using namespace std;

int main() {
    ifstream cin("rucsac.in");
    ofstream cout("rucsac.out");

    int n, g;
    cin >> n >> g;

    vector<int> dp(g + 1, 0);

    for (int i = 0; i < n; ++i) {
        int w, p;
        cin >> w >> p;

        for (int j = g; j >= w; --j)
            dp[j] = max(dp[j], dp[j - w] + p);
    }

    cout << dp[g] << "\n";

    return 0;
}