#include <fstream>

using namespace std;

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

int n, g, i, cw, w[5010], p[5010], v[10010], j, sol;

int main()
{
    fin>>n>>g;
    for(i=1;i<=n;i++)
        fin>>w[i]>>p[i];

    for(i=1;i<=n;i++){
        for(j=g-w[i];j>=0;j--){
            v[j+w[i]]=max(v[j+w[i]], v[j]+p[i]);
            if(v[j+w[i]]>sol)
                sol=v[j+w[i]];
        }
    }

    fout<<v[g];

    return 0;
}