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

console.log('How old are you ?')
process.stdin.on('data', (number) => {
let result = 2019 - number;
  if(number <= 100 && number > 0 ){
    console.log(result);
  }
  else {
    console.error('error');
  }
  process.exit()
})