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

function age(text) {
    return 2019 - text;
}

console.log('How old are you ? ')
process.stdin.on('data', (text) => {
    if (text < 99 && text > 0) {
        console.log(age(text));
    } else {
        console.log("write your age please");
    }
    process.exit()
})