#include <fstream>

using namespace std;

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

int v1[5003], v2[5003];
int w[5003], p[5003];

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)
        {
            v2[j] = v1[j];
            if (w[i] <= j)
                v2[j] = max (v2[j], v1[j - w[i]] + p[i]);
        }
        for (j = 1; j <= gmax; j += 1)
            v1[j] = v2[j];
    }
    g << v2[gmax];
    return 0;
}