#include <iostream>
#include <math.h>
using namespace std;
int main()
{
    const double pi=3.1415;
    double x,y,s;
    int n;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
      cin>>x>>y;
      s=0;
      while(sqrt(x*x+y*y)>sqrt((s+50)*2/pi))s+=50;
      cout<<"Property "<<i<<": This property will begin eroding in year "<<s/50+1<<"."<<endl;
    }
    cout<<"END OF OUTPUT."<<endl;
    return 0;  
}