#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;

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

int main(){
    int n, g;
    fin >> n >> g;

    vector<int> w(n), p(n);
    for(int i = 0; i < n; i++)
        fin >> w[i] >> p[i];

    vector<int> dp(g + 1, 0);
    for(int i = 0; i < n; i++)
        for(int j = g; j >= w[i]; j--)
            dp[j] = max(dp[j], dp[j - w[i]] + p[i]);

    fout << dp[g] << "\n";
}