function pets(input) {

   let days = Number(input[0]);
   let food = Number(input[1]);
   let dogFood = Number(input[2]);
   let catFood = Number(input[3]);
   let trutleFood = Number(input[4]) / 1000;

   let foodEaten = (dogFood + catFood + trutleFood) * days;
   let foodLeft = Math.abs(food - foodEaten);

   if (food > foodEaten) {
    console.log(`${Math.floor(foodLeft)} kilos of food left.`);
   } else {
    console.log(`${Math.ceil(foodLeft)} more kilos of food are needed.`)
   }

}