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


console.log('Please enter you age')

process.stdin.on('data', (message) => {
    if (typeof message !== 'string'){

        console.log('A number goddamnit :)!')

     }

     else if (message > 99) {

         console.log('Liar!')

     }

     else if (message == 0 ){

         console.log('Paul you are too young to use a computer!')

     }

     else{
         let sub = 2019 - message
         console.log(sub)
     }

    process.exit()

})