#include <iostream>
#include <vector>
#include <fstream>
using namespace std;

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

    int weight, n;
    fin >> n >> weight;

    vector<int> w(n), value(n);

    for (int i = 0; i < n; i++) {
        fin >> w[i] >> value[i];
    }

    vector<int> dp(weight + 1, 0);
    for (int i = 0; i < n; i++) {
        for (int j = weight; j >= w[i]; j--) {
            dp[j] = max(dp[j], dp[j - w[i]] + value[i]);
        }
    }
    fout << dp[weight] << "\n";

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

    return 0;
}