#include <fstream>

using namespace std;

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

int n, gr, dp[10005], pret[10005], greutati[10005];

void citire() {
    f >> n >> gr;
    for (int i = 1; i <= n; ++i)
        f >> greutati[i] >> pret[i];
}

void dinamica() {
    for (int i = 1; i <= n; ++i)
        for (int j = gr; j >= greutati[i]; --j)
            dp[j]=max(dp[j],dp[j-greutati[i]]+pret[i]);
}

int main() {
    citire();
    dinamica();
    g << dp[gr];
    return 0;
}