poj1005

//accepted zoj

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include"math.h"
#include"iostream"
using namespace std;

typedef struct a_XY
{
 float X;
 float Y;
}a_XY;

//#define pi 3.14159;
int main()
{
 float pi = 3.14159;
 int i=0;
 float *area;
 int n;
 cin>>n;
 a_XY *p_xy=new a_XY[n];
 area=new float[n];
 for(i=0;i<n;i++)
 {
  cin>>p_xy[i].X;
  cin>>p_xy[i].Y;
 }
 
 for(i=0;i<n;i++)
 {
  area[i]=pi*(p_xy[i].X*p_xy[i].X+p_xy[i].Y*p_xy[i].Y)/2;
  if(area[i]>0)
  {
  cout<<"Property "<<i+1;
  cout<<":"<<" This property will begin eroding in year ";
  cout<<(int)(area[i]/50)+1<<"."<<endl;
  }
  else continue;
 }
 cout<<"END OF OUTPUT."<<endl;
 return 0;
 
}