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

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int main() {
    int n, g, w, p;
    fin >> n >> g;

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

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

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

    fout << dp[g];

    fin.close();
    fout.close();

    return 0;
}