#include <fstream>
#define nmax 5002
#define gmax 10002
using namespace std;

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

int n, g, w[nmax], p[nmax], dp[2][gmax];
int main()
{
    fin >> n >> g;
    bool a = 1;
    for (int i = 1; i <= n; i++)
        fin >> w[i] >> p[i];
    for (int i = 1; i <= n; i++){
        a = !a;
        for (int j = 0; j <= g; j++){
            dp[a][j] = dp[!a][j];
            if (w[i] <= j)
                dp[a][j] = max(dp[a][j], dp[!a][j - w[i]] + p[i]);
        }
    }
    fout << dp[a][g];
    return 0;
}