pku 1005

#include <iostream>
using namespace std;
class Node
{
public:
Node(){x=y=0.0;}
public:
float x;
float y;
Node *next;
};
int main()
{
int n;
cin>>n;
Node *start,*pass;
pass=new Node;
start=pass;
float mx,my;
for(int i=0;i<n;i++)
{
cin>>mx>>my;
if(my<0.0)return 0;
pass->x=mx;pass->y=my;
pass->next=new Node;
pass=pass->next;
}
for(int i=1;i<=n;i++)
{
int z;
z=int(((start->x*start->x+start->y*start->y)*3.1415926)/100);
z++;
cout<<"Property "<<i
<<": This property will begin eroding in year "
<<z<<"."<<endl;
start=start->next;
}
cout<<"END OF OUTPUT.";
return 0;
}