#include <iostream>
#include <fstream>
using namespace std;
const int NMAX = 5e3 + 1;
int n, g, dp[2][NMAX], w[NMAX], p[NMAX];
int main()
{
    ifstream fin("rucsac.in");
    ofstream fout("rucsac.out");
    fin >> n >> g;
    for (int i = 1; i <= n; i++)
    {
        fin >> w[i] >> p[i];
    }
    int l = 0;
    for (int i = 1; i <= n; i++, l = 1 - l)
    {
        for (int cw = 0; cw <= g; cw++)
        {
            dp[1 - l][cw] = dp[l][cw];
            if (w[i] <= cw)
            {
                dp[1 - l][cw] = max(dp[1 - l][cw], dp[l][cw - w[i]] + p[i]);
            }
        }
    }
    fout << dp[l][g];
}