#include <algorithm>
#include <iostream>
#include <fstream>
#define NMAX 10010

using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

int v[NMAX];

int main()
{
    int N,G,gr,val;
    f >> N >> G;
    for(int i = 1;i <= N; i++){
        f >> gr >> val;
        for(int j = G; j >= gr; j--)
        {
            v[j] = max (v[j],v[j-gr] + val);
        }
    }
    g << v[G];
    return 0;
}