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

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

int dp[2][100001];

struct obiect{
    int gr;
    int pr;
};

vector<obiect> v;

int main()
{
    int n, g;
    cin >> n >> g;
    v.resize(5001);
    for(int i = 1; i <= n; i++)
    {
        cin >> v[i].gr >> v[i].pr;
    }
    for(int i = 1; i <= n; i++)
    {
        for(int j = 1; j <= g; j++)
        {
            int l_c = i % 2;
            int l_a = (i - 1) % 2;
            if(j - v[i].gr < 0)
            {
                dp[l_c][j] = dp[l_a][j];
            }
            else
            {
                dp[l_c][j] = max((dp[l_a][j - v[i].gr] + v[i].pr), dp[l_a][j]);
            }
        }
    }
    cout << dp[n % 2][g];
    return 0;
}