#include <fstream>

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");


const int MAX = 5001;
int g, n, w, p, dp[MAX], maxx;

int main(){
    fin >> n >> g;
    for (int i = 1; i < MAX; i++)
        dp[i] = -1;
    for (; n; n--){
        fin >> w >> p;
        for (int i = g; i >= w; i--)
            dp[i] = max(dp[i], dp[i - w] + p);
    }
    for (int i = 1; i <= g; i++)
        maxx = max(dp[i], maxx);

    fout << maxx;
    return 0;
}