#include <fstream>

using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

int res[1003][1003];
int w[1003], p[1003];

int main ()
{
    int n, i, j, gmax;
    f >> n >> gmax;
    for (i = 1; i <= n; i += 1)
        f >> w[i] >> p[i];
    for (i = 1; i <= n; i += 1)
    {
        for (j = 1; j <= gmax; j += 1)
        {
            res[i][j] = res[i - 1][j];
            if (w[i] <= j)
                res[i][j] = max (res[i][j], res[i - 1][j - w[i]] + p[i]);
        }
    }
    g << res[n][gmax];
    return 0;
}