#include<fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int main()
{
    int N,G,pd[10001],w[5001],p[5001];
    f>>N>>G;
    for(int i=1;i<=N;++i)
        f>>w[i]>>p[i];
    for(int i=1;i<=N;++i)
        for(int j=G-w[i];j>=0;--j)
        pd[j+w[i]]=max(pd[j+w[i]],pd[j]+p[i]);
    g<<pd[G];
    return 0;
}