#include<fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int p[100001],g[100001],prf[1001],k,n;
int main()
{
	in>>n>>k;
	for(int i=1;i<=n;i++)
		in>>g[i]>>p[i];
	for(int i=1;i<=n;i++)
		prf[i]=-1;
	prf[0]=0;
	for(int i=1;i<=n;i++)
	{
		for(int j=k-g[i];j>=0;j--)
			if(prf[j]!=-1 && prf[j]+p[i]>prf[j+g[i]])
				prf[j+g[i]]=p[i]+prf[j];
	}
	int max=1;
	for(int j=1;j<=k;j++)
		if(prf[j]>max)
			max=prf[j];
	out<<max;
	return 0;
}