#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,gmax,vmax;
struct ruc
{
    int val,gr;

}v[5005];
int main()
{
    int i,j;
    fin>>n>>gmax;
    for(i=1;i<=n;i++)
    {
        fin>>v[i].gr>>v[i].val;
    }
    ruc aux;
    for(i=1;i<n;i++)
    {
        for(j=i+1;j<=n;j++)
        {
            if(v[i].val/v[i].gr>v[j].val/v[j].gr)
            {
                aux=v[i];
                v[i]=v[j];
                v[j]=aux;
            }
        }
    }
    for(i=1;i<=n;i++)
    {
        vmax+=v[i].val;
        gmax-=v[i].gr;
    }
    fin.close();
    fout.close();
    return 0;
}