#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("rucsac.in");
ofstream out("rucsac.out");
int n, g, w[5010], p[5010], i, j, k, d[10010];
int main()
{
    in>>n>>g;
    for(i=1; i<=n; i++)

    for(i=1; i<=n; i++)
    {in>>w[i]>>p[i];
        for(j=g; j>=1; j--)
            if(j-w[i]>=0) d[j]=max(d[j], d[j-w[i]]+p[i]);}
    out<<d[g]<<'\n';
    return 0;
}