#include <fstream>
using namespace std;

ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
int n, g, b[2][10001];
bool e;

int main() {
	cin>>n>>g;
	for(int i=1; i<=n; i++, e=!e) {
		int g1, p1;
		cin>>g1>>p1;
		for(int j=0; j<=g; j++)
			if(j<g1)	
				b[!e][j]=b[e][j];
			else
				b[!e][j]=max(b[e][j], p1+b[e][j-g1]);
	}
	cout<<b[e][g];
	return 0;
}