#include <fstream>
using namespace std;

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

int n, g, dp[2][10005], w[5005], p[5005], pmax;

void citire() {
    fin >> n >> g;
    for(int i = 1; i<= n; i++)
        fin >> w[i] >> p[i];
}

void solve() {
    for(int i = 1; i <= n; i++)
        for(int j = 0; j <= g; j++) {
            dp[i%2][j] = dp[(i-1)%2][j];
            if(j >= w[i]) dp[i%2][j] = max(dp[i%2][j], dp[(i-1)%2][j-w[i]]+p[i]);
            pmax = max(pmax, dp[i%2][j]);
        }
    fout << pmax;
}

int main() {
    citire();
    solve();

}