#include <fstream>

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int Nmax = 5 * 1e3 + 1, Gmax = 1e4 + 1;
int dp[Nmax][Gmax];
int g[Nmax], p[Nmax];

int main()
{
    int n, gr, i, j;

    fin >> n >> gr;
    for(i = 1; i <= n; i++)
        fin >> g[i] >> p[i];

    for(i = 1; i <= n; i++)
        for(j = 1; j <= gr; j++)
            if(j < g[i])
                dp[i][j] = dp[i - 1][j];
            else
                dp[i][j] = max(dp[i - 1][j], dp[i - 1][j - g[i]] + p[i]);


    fout << dp[n][gr];
    return 0;
}