#include<iostream>
#include<fstream>
#include<algorithm>
using namespace std;
int a[3][10001];
int main ()
{
ifstream f("in");
ofstream h("out");
int i,j,G,n,p,g,mat=2;
f>>n>>G;
for(i=1;i<=n;++i)
	{
	f>>g>>p;
	for(j=1;j<=G;++j)
	{
	a[3-mat][j]=a[mat][j];
		if(j>=g)
			a[3-mat][j]=max(a[3-mat][j],a[mat][j-g]+p);
	}
	mat=3-mat;
	}
h<<a[mat][G]<<"\n";
f.close();
h.close();
return 0;
}