> #include<iostream>
> #include<cmath>
> 
> #define pai 3.141593
> using namespace std;
> int main()
> {
> 	int n;
> 	cin>>n;
> 	int i;
> 	int num=0;
> 	for(i=1;i<=n;i++)
> 	{
> 		num++;
> 		float x,y;
> 		int z;
> 		cin>>x>>y;
> 		if(x!=0.0&&y>=0.0)
> 		{
> 			
> 		    float dis=x*x+y*y;
> 		    float rr;
> 		    for(z=1;;z++)
> 			{
> 	    	   rr=100*z/pai;
> 			   if(rr>dis) 
> 			    	break;
> 			}
> 		    cout<<"Property "<<num<<": This property will begin eroding in year "<<z<<'.'<<endl;
> 		}
> 	}
> 	cout<<"END OF OUTPUT."<<endl;
> 	return 0;
> }