#include <fstream>
using namespace std;
ifstream in ("rucsac.in");
ofstream out ("rucsac.out");

int n,g,a[1005],cost[1005],val[1005];

int main()
{
    int i,j;
    in>>n>>g;
    for(i=1;i<=n;i++)
        in>>cost[i]>>val[i];
    for(i=1;i<=n;i++)
        for(j=g-cost[i];j>=0;j--)
            if(val[i]+a[j]>a[j+cost[i]])
                a[j+cost[i]]=val[i]+a[j];
    out<<a[g];
    return 0;
}