#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("rucsac.in");
ofstream out("rucsac.out");
int n, g, i, j, d[10010], p, w;
int main()
{
    in>>n>>g;
    for(i=1; i<=n; i++)
    {in>>w>>p;
        for(j=g; j>=1; j--)
            if(j-w>=0) d[j]=max(d[j], d[j-w]+p);}
    out<<d[g]<<'\n';
    return 0;
}