#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,G,i,j,sol;
int a[5001],p[5001],b[10002];
int main()
{
    f>>n>>G;
    for(i=1;i<=n;++i) f>>a[i]>>p[i];
    for(i=1;i<=n;++i)
        for(j=G-a[i];j>=0;--j)
            if(b[j+a[i]]<b[j]+p[i])
            {
                b[j+a[i]]=b[j]+p[i];
                sol=max(sol,b[j+a[i]]);
            }
    g<<sol;
    g.close();
    return 0;
}