#include <iostream>
#include <fstream>
#define nl '\n'

using namespace std;

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

const int GMAX = 1e4+5;

int N, G, dp[2][GMAX], ok, ans;

int main()
{
    fin >> N >> G;
    for (int i = 1; i <= N; i++)
    {
        int w, p;
        fin >> w >> p;
        ok = 1-ok;
        for (int j = w; j <= G; j++)
            dp[ok][j] = max(dp[1-ok][j], dp[1-ok][j-w]+p);
    }
    for (int i = 1; i <= G; i++)
        ans = max(ans, dp[ok][i]);
    fout << ans;
    return 0;
}