#include <fstream>

using namespace std;

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

const int NMAX = 5000 + 5;
const int GMAX = 10000 + 5;

int N, G;
int w[NMAX], p[NMAX], dp[GMAX];

int main()
{
    fin >> N >> G;

    for(int i = 1; i <= N; i++)
        fin >> w[i] >> p[i];

    for(int i = 1; i <= N; i++)
        for(int j = G; j >= w[i]; j--)
            dp[j] = max(dp[j], dp[j - w[i]] + p[i]);

    fout << dp[G] << '\n';

    return 0;
}