function backToThePast (input) {
    let ownMoney = Number(input[0]);
    let yearToLive = Number(input[1]);
  
    let age = 18;
  
    for (let year = 1800; year <= yearToLive; year++) {
      if (year % 2 === 0) {
        ownMoney -= 12000;
            age++;
      } else {
        ownMoney -= (12000 + 50 * age)
            age++;
      }
      
    }
    if (ownMoney >= 0) {
     console.log(`Yes! He will live a carefree life and will have ${ownMoney.toFixed(2)} dollars left.`)
    } else {
      console.log(`He will need ${Math.abs(ownMoney).toFixed(2)} dollars to survive.`)
    }
  }