#include <fstream>
#include <vector>

using namespace std;
//obj(greutate, valoare)
vector <pair <int, int> > obj;
int rucsac(int n, int g){
    vector <vector <int> > dp;
    dp.resize(n + 1, vector <int>(g + 1));
    for(int i = 0; i <= n; ++i){
        for(int j = 0; j <= g; ++j){
            if(i == 0 || j == 0){
                dp[i][j] = 0;
            }
            else if(obj[i].first > j){
                dp[i][j] = dp[i - 1][j];
                //nu luam obiectul
            }
            else{
                int val = obj[i].second;
                int greutate = obj[i].first;
                dp[i][j] = max(dp[i - 1][j], val + dp[i - 1][j - greutate]);
                //maximul dintre optiunea a lua obiectul sau nu
            }
        }
    }
    return dp[n][g];
}
int main()
{
    ifstream f("rucsac.in");
    ofstream g("rucsac.out");
    int n, gmax;
    f >> n >> gmax;
    obj.resize(n + 1);
    for(int i = 1; i <= n; ++i){
        int w, v;
        f >> w >> v;
        obj[i] = make_pair(w, v);
    }
    g << rucsac(n, gmax);
    f.close();
    g.close();
    return 0;
}