#include <fstream>

using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
struct asd{
    int gr,pr;
}a[5005];
int N,G;
int d[10005];
int main()
{
    f >> N >> G;
    for(int i = 1; i <= N; i++){
        f >> a[i].gr >> a[i].pr;
    }
    for(int i = 1; i <= N; i++){
        for(int j = G; j >= a[i].gr; j--){
            d[j] = max(d[j],d[j - a[i].gr] + a[i].pr);
        }
    }
    g << d[G];
    return 0;
}