Fred
Mapper is considering purchasing some land in Louisiana to build his
house on. In the process of investigating the land, he learned that the
state of Louisiana is actually shrinking by 50 square miles each year,
due to erosion caused by the Mississippi River. Since Fred is hoping to
live in this house the rest of his life, he needs to know if his land is
going to be lost to erosion.

After doing more research, Fred
has learned that the land that is being lost forms a semicircle. This
semicircle is part of a circle centered at (0,0), with the line that
bisects the circle being the X axis. Locations below the X axis are in
the water. The semicircle has an area of 0 at the beginning of year 1.
(Semicircle illustrated in the Figure.)

Each
of the next N lines will contain the X and Y Cartesian coordinates of
the land Fred is considering. These will be floating point numbers
measured in miles. The Y coordinate will be non-negative. (0,0) will not
be given.

#include<cstdio>

#include<cstring>

#include<algorithm>

#include<math.h>

using namespace std;

typedef long long LL;

const double pi = 3.1415926;

int main()

{

    int t;

    scanf("%d",&t);

    for(int i=; i<=t; i++)

    {

        double x,y;

        scanf("%lf%lf",&x,&y);

        double r = x*x+y*y;  ///半径的平方

        printf("Property %d: This property will begin eroding in year %d.\n",i,(int)((r)*pi/+));

    }

    printf("END OF OUTPUT.\n");

    return ;

}