#include<fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, gmax, v[10005], val, g;
int main()
{
	fin >> n >> gmax;
	for (int i = 1; i <= n; i++)
	{
		fin >> g >> val;
		for (int j = gmax; j >= g; j--)
			if (v[j] < v[j - g] + val)
				v[j] = v[j - g] + val;
	}
	fout << v[gmax];
	fin.close();
	fout.close();
	return 0;
}