#include <fstream>

using namespace std;

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

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

int N, G;
int w[NMAX + 5], p[NMAX + 5];

int dp[GMAX + 5];

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 g = G; g >= w[i]; g--)
            dp[g] = max(dp[g], p[i] + dp[g - w[i]]);

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

    return 0;
}