#include <fstream>
#define NMAX 10005
#define GMAX 5010

using namespace std;

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

int n, G, val;
int W[GMAX], P[GMAX], dp[2][NMAX];

void citire();
void pd();

int main()
{
    citire();
    pd();
    fout<<dp[1-val][G]<<'\n';
    return 0;
}
void citire()
{
    int i;
    fin>>n>>G;
    for (i=1; i<=n; i++)
        fin>>W[i]>>P[i];
}
void pd()
{
    int i, j;
    val=1;
    for (i=1; i<=n; i++)
        {
        for (j=0; j<=G; j++)
            {
            dp[val][j]=dp[1-val][j];
            if (W[i]<=j)
                if (dp[val][j]<dp[1-val][j-W[i]]+P[i])
                    dp[val][j]=dp[1-val][j-W[i]]+P[i];
            }
        val=1-val;
        }
}