#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g,v[100005],w[5005],p[5005];
int main()
{
    int i,j;
    fin>>n>>g;
    for (i=1;i<=n;++i)
        fin>>w[i]>>p[i];
    for (i=1;i<=n;++i)
        for (j=g;j>=w[i];--j)
            v[j]=max(v[j],v[j-w[i]]+p[i]);
    fout<<v[g]<<'\n';
    return 0;
}