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

console.log('How old are you ? ')
process.stdin.on('data', (age) => {

  if(isNaN(age)) {
    console.log('Please enter a age')}

  else if(age > 99) {
    console.log('Please enter a maximum age of 99')}

  else if(age === 0) {
    console.log('You were born on 2017')}

  else {
    console.log('You were born on ' + (2018-age))
    process.exit()
  }
})