#include <bits/stdc++.h>
using namespace std;

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

int n, g, w[5005], p[5005];

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

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