#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
const int NMAX = 1e4 + 5;
const int GMAX = 5e3 + 5;
int w[NMAX], p[NMAX], a[NMAX][GMAX];
int main()
{
	int n, G;
	f >> n >> G;
	for(int i = 1; i <= n; i++)
		f >> w[i] >> p[i];
	int l = 0;
	for(int i = 1; i <= n; i++, l = 1 - l)
		for(int j = 1; j <= G; j++)
		{
			a[1 - l][j] = a[l][j];
			if(w[i] <= j)
				a[1 - l][j] = max(a[1 - l][j], a[l][j - w[i]] + p[i]);
		}
	g << a[l][G];
}