#include <bits/stdc++.h>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,g,i,w[5010],p[5010],d[10010],cw,ans;
int main()
{
    fin>>n>>g;
    for(i=1;i<=n;i++)
        fin>>w[i]>>p[i];
    for(i=1;i<=n;i++)
        for(cw=g-w[i];cw>=0;cw--)
            if(d[cw+w[i]]<d[cw]+p[i])
            {
                d[cw+w[i]]=d[cw]+p[i];
                ans=max(d[cw+w[i]],ans);
            }
    fout<<ans;
    return 0;
}