#include <fstream>
#include<cmath>

using namespace std;

#define MXN 5001
#define MXG 5001
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int D[MXN][MXG];
int n,g;
int w[MXN],p[MXN];

int rucsac(int i,int j)
{
	if(i==0) return 0;
	if(D[i][j]!=0) return D[i][j];
	if(j<w[i]) return D[i-1][j]=rucsac(i-1,j);
	return D[i][j]=max(rucsac(i-1,j),rucsac(i-1,j-w[i])+p[i]);
}

int main()
{
	int i;
	fin>>n>>g;
	for(i=1;i<=n;i++)
		fin>>w[i]>>p[i];
	fout<<rucsac(n,g);
	return 0;
}