#include<fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int v[2][10005],n,i,w,pr,j,gr;
int main()
{
	f>>n>>gr;
	for(i=1;i<=n;i++)
	{
		f>>w>>pr;
		for(j=w;j<=gr;j++)
		{
			if(v[(i-1)%2][j]>v[(i-1)%2][j-w]+pr)
			{
				v[i%2][j]=v[(i-1)%2][j];
			}
			else
			{
				v[i%2][j]=v[(i-1)%2][j-w]+pr;
			}
		}
	}
	g<<v[n%2][gr];
}