> #include <iostream>
> #include <cmath>
> using namespace std;
> double pi=3.1415926;
> int main()
> {
>     int k,count=1;
>     double s,x,y;
>     cin>>k;
>     while(k--)
>     {
>         cin>>x>>y;
>         s=(pi/2)*(x*x+y*y);
>         cout<<"Property "<<count++<<": This property will begin eroding in year "<<(int)(s/(double)50+1)<<"."<<endl;
>     }
>     cout<<"END OF OUTPUT."<<endl;
>     return 0;
> }