const PI = Math.PI;
const illigal = 'Illegal r value';

let checkRadius = function(r) {
    if (r > 0 && r <= 100 && r !== NaN)
        return true;
      
    return false;
}

let circleArea = function(r) {
    if (checkRadius(r)) 
        return PI * r * r;
    
    return illigal;
}

let circlePerimeter = function(r) {
    if (checkRadius(r)) 
        return 2 * PI * r;
    
    return illigal;
    
}

function main() {
    // Write your code here. Read input using 'readLine()' and print output using 'console.log()'.
       
    let r = Number.parseFloat(readLine()).toFixed(3);   // r refers to radius
    
    // Print the area of the circle:
    console.log(circleArea(r));
    
    // Print the perimeter of the circle:
    console.log(circlePerimeter(r));
    

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

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