> #include "stdio.h"
> #include "math.h"
> #define PI 3.1415
> int main()
> {
> 	int n,i,num=0;
> 	float x,y,s,r,a,b,c;
> 	a=0;b=0;
>     while(scanf("%d",&n)!=EOF)
> 		{scanf("%f %f",&x,&y);if(y<0)return 0;num++;
> 		 for(i=1;;i++)
> 			{s=i*100;r=sqrt(s/PI);c=sqrt((x-a)*(x-a)+(y-b)*(y-b));
> 			 if(c<r){printf("Property %d: This property will begin eroding in year %d.\n",num,i);break;}
> 			}n--;
> 		 if(n==0){printf("END OF OUTPUT");return 0;}
> 		}
> }