SkiTrip

function SkiTrip(input){
 let days = Number(input.shift());
 let room = input.shift();
 let rating = input.shift();
 let roomForOnePerson = 18.00;
 let apartament = 25.00;
 let presidentRoom = 35.00;
 let Sum = 0;
 let result = 0;

 if(room === "apartment"){
    if(days <= 10){
        Sum = (days - 1) * apartament;
        result = Sum - (Sum  * 0.3);
    }
    else if(days <= 15){
        Sum = (days - 1) * apartament;
        result = Sum - (Sum * 0.35);
    }
    else if(days > 15){
        Sum = (days - 1) * apartament;
        result = Sum - (Sum / 2);
    }
 }
 else if(room === 'president apartment'){
     if(days <= 10){
         Sum = (days - 1) * presidentRoom;
         result = Sum - (Sum * 0.1);
     }
     else if(days <= 15){
         Sum = (days - 1) * presidentRoom;
         result = Sum - (Sum * 0.15);
     }
     else if(days > 15){
         Sum = (days - 1) * presidentRoom;
         result = Sum - (Sum * 0.2);
     }

 }
 else if(room === "room for one person"){
       result = (days - 1) * roomForOnePerson;
 }
 if(rating === "positive"){
     Sum = result * 1.25;
     console.log(Sum.toFixed(2));
 }
 else if(rating === 'negative'){
     Sum = result * 0.90;
     console.log(Sum.toFixed(2));
 }
}

SkiTrip(['14','apartment','positive']);
SkiTrip(['30','president apartment','negative']);