> #include<iostream>
> #include<math.h>
> using namespace std;
> float R(float x,float y)
> {
> 	return sqrt(x*x+y*y);
> };
> int year(float r)
> {
> 	int year=0;
> 	float area=1.5707963*r*r;
> 	for(float i=0;i<area;i+=50.0)
> 	{
> 		year++;
> 	}
> 	return year;
> };
> int main()
> {
> 	int N;
> 	cin>>N;
> 	float x[N],y[N],r;
> 	for(int j=0;j<N;j++)
> 	{
> 		cin>>x[j]>>y[j];
> 		r=R(x[j],y[j]);
> 		cout<<"Property "<<j+1<<": This property will begin eroding in year "<<year(r)<<endl;
> 	}
> 	cout << "END OF OUTPUT."<<endl;
> 	return 0;
> }