#include<fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int D[10001],w[5001],p[5001],n,i,j,ma,G;
int main ()
{
	f>>n>>G;
	for(j=1;j<=G;++j)
		D[j]=-1;
	for(i=1;i<=n;++i)
	{
		f>>w[i]>>p[i];
	}
	for(i=1;i<=n;++i)
	{
		for(j=G-w[i];j>=0;--j)
		{
			if(D[j+w[i]]<D[j]+p[i])
				D[j+w[i]]=D[j]+p[i];
		}
	}
	for(j=0;j<=G;++j)
		if(D[j]>ma)
			ma=D[j];
	g<<ma;
	return 0;
}