import std.algorithm, std.array, std.container, std.range, std.bitmanip;
import std.numeric, std.math, std.bigint, std.random, core.bitop;
import std.string, std.conv, std.stdio, std.typecons;

void main()
{
  auto r = readln.chomp.to!real;
  writefln("%f %f", PI * r ^^ 2, 2 * PI * r);
}