#include <fstream>
using namespace std;
ifstream fin("rucsac.in");ofstream fout("rucsac.out");
int n,g,pmax,greu[5001],cost[10001],a[5001][10001],i,key,j;
int main()
{
    fin>>n>>g;
    for(i=1;i<=n;i++) fin>>greu[i]>>cost[i];
    for(i=1;i<=n;i++,key=1-key)
        for(j=1;j<=g;j++)
        {
            a[1-key][j]=a[key][j];
            if(greu[i]<=j) a[1-key][j]=max(a[1-key][j],a[key][j-greu[i]]+cost[i]);
        }
    fout<<a[key][g];
    return 0;
}