#include <fstream>
using namespace std;
 
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int n, g, a[2][10001];
bool e;
 
int main() {
	cin >> n >> g;
	for(int i=0; i<n; i++, e=!e) {
		int g1, p1;
		cin >> g1 >> p1;
		for(int j=0; j<g1; j++)
			b[!e][j] = b[e][j];
		for(int j=g1; j<=g; j++)
			b[!e][j] = max(b[e][j], p1 + b[e][j - g1]);
	}
	cout << b[e][g];
	return 0;
}