#include <fstream>
#include <vector>

using namespace std;

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

struct obiect{
    int w, p;
};

struct linie{
    int cur, ant;
};

int dp[2][10001];
vector < obiect > v;
linie lin;

int main()
{
    v.resize(5001);
    int n, g;
    cin >> n >> g;
    for(int i = 1; i <= n; i++)
    {
        cin >> v[i].w >> v[i].p;
    }
    for(int i = 1; i <= n; i++)
    {
        for(int j = 1; j <= g; j++)
        {
            lin.cur = i % 2;
            lin.ant = (i - 1) % 2;
            if(j < v[i].w)
            {
                dp[lin.cur][j] = dp[lin.ant][j];
            }
            else 
            {
                dp[lin.cur][j] = max(dp[lin.ant][j - v[i].w] + v[i].p, dp[lin.ant][j]);
            }
        }
    }
    cout << dp[n % 2][g];
    return 0;
}