#include <fstream>
#define DIM 5001
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g,i,j,sol,c[DIM],p[DIM],d[DIM];
int main() {
    fin>>n>>g;
    for (i=1;i<=n;i++)
        fin>>c[i]>>p[i];
    for (i=1;i<=n;i++)
        for (j=g-c[i];j>=0;j--)
            if (d[j]+p[i]>d[j+c[i]])
                d[j+c[i]]=d[j]+p[i];
    for (i=1;i<=g;i++)
        sol=max(sol,d[i]);
    fout<<sol;
    return 0;
}