import java.util.*; import java.lang.Math.*; public class ppp { public static void main(String[] args) { Scanner sc=new Scanner(System.in); double eps=0.000000000001; int t=sc.nextInt(); for(int p=0;p=x && ny-eps<=y && ny+eps>=y){ ans=mid; System.out.println(ans*180/Math.PI); break bi; } if(nx-eps>x || ny+eps