#include <bits/stdc++.h>

using namespace std;

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

int dp[100001];

int n, g;

int main()
{
    in >> n >> g;
    for(int i = 1; i <= n; i++)
    {
        int greutate, pret;
        in >> greutate >> pret;
        for(int j = g; j >= greutate; j--)
            dp[j] = max(dp[j], pret + dp[j - greutate]);
    }
    int maxim = 0;
    for(int i = 1; i <= g; i++)
    {
        maxim = max(maxim, dp[i]);
    }
    out << maxim;
    return 0;
}