import java.util.*; import java.util.stream.Stream; import java.time.*; import java.time.format.*; public class No98 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); double x = sc.nextDouble(); double y = sc.nextDouble(); System.out.println(Math.sqrt(Math.pow(x,2) + Math.pow(y,2)) * 2 + 1); } }