#include <fstream>

using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
const int nmax=1001;

int a[nmax+5][10006],n,g,cost=10005;

int main()
{
    int i,x,y,j;
    fin>>n>>g;
    for(i=1;i<=n;i++)
    {
        fin>>x>>y;
        //a[i][y]=max(a[i-1][y],a[i-1][])
        for(j=1;j<=10002;j++)
        {
            if(j>=y) a[i][j]=max(a[i-1][j],a[i-1][j-y]+x);
            else a[i][j]=a[i-1][j];
            if(a[i][j]>=g && j<cost)
            {
               cost=j;
            }
        }
    }
    fout<<cost;
    return 0;
}