#include <fstream>
#define maxn 5001
#define maxg 10001

using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int W[maxn], P[maxn];
int Optim[maxg];
int main()
{
	int N, G;
	f>>N>>G;
	for (int i = 1; i <= N; ++i) {
		f>>W[i]>>P[i];
	}
	Optim[0] = 0;
	int sol = 0;
	for( int i = 1; i <= N; ++i)
		for( int j = G - W[i]; j >= 0; --j) {
			if( Optim[j+W[i]] < Optim[j] + P[i] )
			{
				Optim[j+W[i]] = Optim[j] + P[i];
				if( Optim[j+W[i]] > sol)
					sol = Optim[j+W[i]];
			}
		}
	g<<sol;
	return 0;
}