#include <fstream>
using namespace std;

ifstream cin("rucsac.in");
ofstream cout("rucsac.out");
struct item {
	int g, p;
} a[5001];
int n, g, b[2][10001];
bool e;

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