#include <fstream>

using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");

int n, g, i, j, f[2][10001], w[10001], p[10001], k=0;

int main()
{
    in>>n>>g;
    for(i=1;i<=n;i++)
    {
        k=1-k;
        in>>w[i]>>p[i];
        for(j=1;j<=g;j++)
        {
            f[k][j]=f[1-k][j];
            if(f[1-k][j-w[i]]+p[i]>f[k][j] && w[i]<=j) f[k][j]=f[1-k][j-w[i]]+p[i];
        }
    }
    out<<f[k][g];
    return 0;
}