const PI = Math.PI;
 let r = readLine();
 let area;
 area = PI*r*r;
 console.log(area);
 let perimeter; 
  perimeter = PI*r*2;
 console.log(perimeter);

function main() {
    // Write your code here. Read input using 'readLine()' and print output using 'console.log()'.
    const PI = Math.PI;
    let r = readLine()
    // Print the area of the circle:
     const pis = Math.pow(r,2);
     let ac = PI * pis;
     console.log(ac);
    // Print the perimeter of the circle:
     let pc = 2*PI * r;
     console.log(pc);``

function main() {
    const PI=Math.PI;
    let r=readLine();
    // Print the area of the circle:
    let area;
    area=PI*(r**2);
    console.log(area);
   
    // Print the perimeter of the circle:
    let perimeter;
    perimeter=2*PI*r ;
    console.log(perimeter);