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

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

#define cin fin
#define cout fout

#define gmax 10001
#define nmax 5001

int n, gMax;
int greutate[nmax];
int profit[nmax];

int dp[2][gmax];

void read()
{
    cin >> n >> gMax;
    for(int i = 1; i <= n; i++)
    {
        cin >> greutate[i] >> profit[i];
    }
}

void solve()
{
    int curent = 1;
    for(int i = 1; i <= n; i++)
    {
        /// luam fiecare obiect si il verificam
        for(int j = gMax; j >= 1; j--)
        {
            dp[curent][j] = dp[1 - curent][j];

            if(j >= greutate[i])
            {
                dp[curent][j] = max(dp[1 - curent][j], dp[1 - curent][j - greutate[i]] + profit[i]);
            }
        }
        curent = 1 - curent;
    }

    cout << dp[1 - curent][gMax] << endl;
}

int main()
{
    read();
    solve();
}