#include <fstream>
#define gmax 10001
#define vmax 5001
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int n,gm;
int cmax[gmax],c[vmax],g[vmax];
int main()
{int i,j;
    fin>>n>>gm;
    for (i=1; i<=n; i++)
        fin>>g[i]>>c[i];
    for (i=1; i<=n; i++)
        {
            for (j=gm; j>0; j--)
                if (j>=g[i])
                    if (c[i]+cmax[j-g[i]]>cmax[j])
                        cmax[j]=c[i]+cmax[j-g[i]];
        }
    fout<<cmax[gm];
    return 0;
}