#include <fstream>

using namespace std;

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

// 1 ≤ N ≤ 5000
// 1 ≤ G ≤ 10000
// 0 ≤ Wi, Pi ≤ 10000

const int MAX_N = 5001;
const int MAX_G = 10001;

int dp[MAX_N][MAX_G];

struct t_object {
    int greutate;
    int profit;
};

int main() {

    int nr_elem;
    int gmax;
    t_object objs[MAX_N];

    fin >> nr_elem >> gmax;

    for (int i = 1; i <= nr_elem; i++) {
        int greutate;
        int profit;

        fin >> greutate >> profit;
        t_object obj = {greutate, profit};

        objs[i] = obj;
    }

    for (int idx = 1; idx <= nr_elem; idx++) {
        for (int g = 0; g <= gmax; g++) {
            t_object obj = objs[idx];

            if (obj.greutate > g) {
                dp[idx][g] = dp[idx - 1][g];
            } else {

                int profit1 = dp[idx - 1][g];
                int profit2 = obj.profit + dp[idx - 1][g - obj.greutate];

                dp[idx][g] = max(profit1, profit2);
            }
        }
    }

    fout << dp[nr_elem][gmax] << endl;

    return 0;
}