#include <iostream>
using namespace std;
class stac
{
  private:
    int a, b, l, n, k=0,plot;
  public:
    stac():a(0),b(0), l(0), plot(0){}
    stac(int x,int y, int z):a(x),b(y),l(z){}
    ~stac(){}
    void operator ++(int)
    {
      cin>>n;
      for (int i=0; i<n; i++)
      cin>>a>>b>>l;
    }
    void operator ++()
    {
      if(b>1000)
      {
        while(b>1000)
        {
          b=b-1000;
          k++;
        }
      }
      else
      {
        k=0;
      }
      if(k>a)
        k=a;
    }
    int get_plot()
    {
      return k;
    }
};
int main()
{
  stac s; 
  s++;
  ++s;
  cout<<s.get_plot(); ???????????????
  
}