> #include <iostream>
> #include <vector>
> #include <math.h>
> 
> using namespace std;
> 
> int main()
> {
> 	int N ;
> 	double X,Y;
> 	cin >> N ;
> 	if ( N == 0 )
> 		cout<<"END OF OUTPUT."<<endl;
> 	vector<int> yearVector;
> 	double pi = 3.14 ;
> 	double year;
> 	double perYear = 50.0 ; 
> 	for ( int i = 0 ; i < N ; i ++ )
> 	{
> 		cin >> X >> Y ;
> 		year = ( 0.5 * pi * ( X * X + Y * Y ) ) / perYear ;
> 		yearVector.push_back( ceil ( year ) );
> 	}
> 	for ( int i = 0 ; i < N ; i ++ )
> 		cout<<"Property "<<i<<": This property will begin eroding in year "<<yearVector[i]<<"."<<endl;
> 	
> 	return 0;
> }