#include <bits/stdc++.h>
#define int long long

using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");

int dp[10005];
signed main()
{
    int n, g;
    in>>n>>g;
    pair<int, int> v[5005];
    for(int i = 0; i < n; i++)
        in>>v[i].first>>v[i].second;
    for(int i = 0; i < n; i++)
    {
        for(int j = g; j >= v[i].first; j--)
        {
            dp[j] = max(dp[j], dp[j - v[i].first] + v[i].second);
        }
    }
    out<<dp[g];
}