process.stdin.resume();
process.stdin.setEncoding('utf8');

var lines = []
var reader = require('readline').createInterface({
  input: process.stdin,
  output: process.stdout
});

reader.on('line', (line) => {
  lines.push(line);
});

reader.on('close', () => {
 var r = Number(lines[0]);

 var ans = [];
 ans.push(Math.PI * r * r);
 ans.push(Math.PI * 2 * r);
  
 console.log(ans.join(' '));
 
});
