#include <fstream>
#include <vector>

using namespace std;

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

typedef pair<int, int> pi;

const int NMAX = 5001;
const int GMAX = 1e4 + 1;

long long dp[GMAX];

int n, g, w, p;

int main()
{
    fin >> n >> g;
    for (int i = 1; i <= n; ++i)
    {
        fin >> w >> p;

        for (int j = g; j >= w; --j)
            dp[j] = max(dp[j], dp[j - w] + p);
    }

    fout << dp[g] << '\n';

    return 0;
}