#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,G,w[5002],p[5002],d[10003],sol;
int main()
{
    f>>n>>G;
    for(int i=1;i<=n;++i)
    {
        f>>w[i]>>p[i];
    }
    for(int i=1;i<=n;++i)
    {
        for(int cw=G;cw>=w[i];--cw)
        {
            if(d[cw]<d[cw-w[i]]+p[i])
            {
                d[cw]=d[cw-w[i]]+p[i];
                sol=max(sol,d[cw]);
            }
        }
    }
    g<<sol;
    return 0;
}