#include <fstream>
using namespace std;
 
ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int n, g, a[2][10001];
bool e = 1;
 
int main() {
	cin >> n >> g;
	while(n--) {
		e = !e;
		int g1, p1;
		cin >> g1 >> p1;
		for(int i=0; i<g1; i++)
			a[!e][i] = a[e][i];
		for(int i=g1; i<=g; i++)
			a[!e][i] = max(a[e][i], p1 + a[e][i - g1]);
	}
	cout << a[e][g];
	return 0;
}