#include <fstream>
#include <algorithm>
#define NMAX 5001

using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

int dp[NMAX][2*NMAX], i, j, n, m, G, cost, gr, best;

int main()
{
    f>>n>>G;

    for (i=1; i<=n; ++i)
    {
        f>>gr>>cost;

        for (j=0; j<=G; ++j)
            {
                dp[i][j]=dp[i-1][j];
                if (j>=gr)
                    dp[i][j]=max(dp[i][j],dp[i-1][j-gr]+cost);
            }
    }

    g<<dp[n][G];
    return 0;
}