#include <fstream>
 
using namespace std;
ifstream f("rucsac.in");
ofstream gu("rucsac.out");
int n,g,i,j,sol,optim[10005],w[10005],p[10005];
int main()
{
    f>>n>>g;
    for(i=1;i<=n;i++)
        f>>w[i]>>p[i];
    for(i=1;i<=n;i++)
        for(j=g-w[i];j>=0;j--)
            if(optim[j+w[i]]<optim[j]+p[i])
            {
                optim[j+w[i]]=optim[j]+p[i];
                if(optim[j+w[i]]>sol)
                    sol=optim[j+w[i]];
            }
    gu<<sol;
    return 0;
}