> #include<stdio.h>
> #include<math.h>
> #define PAI 3.1415
> main()
> {
> 	float a,b,s;int n,i=1,x;
> 	scanf("%d",&n);
> 	while(n>0)
> 	{
> 	  scanf("%f %f",&a,&b);
> 	  s=PAI*(a*a+b*b)/2.0;
> 	  x=s/50;
> printf("Property %d: This property will begin eroding in year d\n",i,x+1);
> 	  n--;
> 	  i++;
> 	}
> 	printf("END OF OUTPUT.\n");
> }