poj 1005 I Think I Need a Houseboat

#include <iostream>
#define pi 3.1415926535898
using namespace std;
int main()
{
    double x,y;
    int n;
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>x>>y;
        cout<<"Property "<<i<<": This property will begin eroding in year "<<(int)(0.5*pi*(x*x+y*y)/50)+1<<".\n";
    }
    cout<<"END OF OUTPUT.\n";
    return 0;
}