> #include<stdio.h>
> int main()
> {
> 	int n,i,j,b[20];
> 	double a[20][2],r2,pi=3.1415;
> 	scanf("%d",&n);
> 	for(i=0;i<n;i++)
> 		scanf("%lf%lf",&a[i][0],&a[i][1]);
> 	
> 	
> 	for(i=0;i<n;i++)
> 	{
> 		r2=a[i][0]*a[i][0]+a[i][1]*a[i][1];
> 		for(j=0;;j++)
> 			if(j*50*2>pi*r2)
> 			{
> 				b[i]=j;break;
> 			}
> 		printf("Property %d: This property will begin eroding in year %d.\n",i+1,j);	
> 	}
> 	printf("END OF OUTPUT.");
> 	return 0;
> }