#include <iostream>
#include <math.h> 
using std::cout ;
using std::cin  ;

int main(){
	int size ;
	float a[100][2]  ;
	int y = 1 ;
    double pi =  3.1415926535897932 ;
	cin >> size ;

	for (int i=0 ;i<size;i++)
	{
		for (int j= 0 ;j<2;j++)
		{
			cin >> a[i][j] ;
		}
	}
	for (int m = 0; m < size ;m++)
	{
		y += ((a[m][0]*a[m][0]+a[m][1]*a[m][1])*pi)/(50*2)  ;
		cout << "Property " << m+1 << ": This property will begin eroding in year " <<y<<".\n";
	}
	cout <<"END OF OUTPUT"<<"\n" ;
	return 0 ;
}