1. Christmass Spirit

function xmassSpirit(input){
let maxQuant=Number(input[0]);
let days=Number(input[1]);
let spirit=0;
let cost=0;

for (let i=1; i<=days; i++){

    if (i%11===0){
        maxQuant+=2;
    }
    if (i%2===0){
        cost+=maxQuant*2;
        spirit+=5;
    }
    if (i%3===0){
        cost+=(maxQuant*5)+(maxQuant*3);
        spirit+=13;
    }

    if (i%5===0){
        cost+=maxQuant*15;
        spirit+=17;
        if (i%3===0){
            spirit+=30;
        }
    }

    if (i%10===0){
        spirit-=20;
        cost+=23;      
    }
}
if (days%10==0){
    spirit-=30;
}

console.log(`Total cost: ${cost}`);
console.log(`Total spirit: ${spirit}`)
}



2. Santa's List

function santasList(input){
    let kidsList=input.shift()
    .split("&");
   
    let commandsArr=input;
    commandsArr.pop();
  

    for (let i=0; i<commandsArr.length; i++){
        let command=commandsArr[i].split(" ");
        if (command.includes("Good")){
            let goodKid=command[1];
            if (kidsList.includes(goodKid)){
                let indexOfGoodKid=kidsList.indexOf(goodKid);
                kidsList.splice(indexOfGoodKid,1);
            }
        } else if (command.includes("Bad")){ 
            let badKid=command[1];
            if (!kidsList.includes(badKid)){
                kidsList.unshift(badKid);
            }
        } else if(command.includes("Rename")){
            let oldName=command[1];
            let newName=command[2];
            if (kidsList.includes(oldName)){
                let indexOfOldName=kidsList.indexOf(oldName);
                kidsList.splice(indexOfOldName,1,newName);
            }
    
        } else if (command.includes("Rearrange")){
            let name=command[1];
            if (kidsList.includes(name)){
                let indexOfName=kidsList.indexOf(name);
                kidsList.splice(indexOfName,1);
                kidsList.push(name);
            }
        }
}
console.log(kidsList.join(", "));
}


3. Present Delivery

 function presentDelivery(input){
    let housesArr=input.shift()
    .split("@");
    housesArr=housesArr.map(Number);
  
    let jumpCommands=input;


    let position=0;
    let landedAt=0;

    for (let i=0; i<jumpCommands.length-1;i++){
        let command=jumpCommands[i];
        if (command.includes("Merry Xmas!")){
            break;
        } else {
            let jumpArr=command.split(" ");
            let jumpLength=Number(jumpArr[1]);
            landedAt=position+jumpLength;    
        
            
            while (landedAt>=housesArr.length){
         
                landedAt=landedAt-(housesArr.length);
             
            } 
 
            position=landedAt;
 
         
            if (housesArr[landedAt]>=2){
            housesArr[landedAt]-=2;
            } else {
                console.log(`House ${landedAt} will have a Merry Christmas.`);
            }
        }
    }
    console.log(`Santa's last position was ${landedAt}.`);

    let failedHouses=0;
    housesArr.forEach(house => {
        if (house!==0){
            failedHouses++;
        }
    });
    if (failedHouses!==0){
    console.log(`Santa has failed ${failedHouses} houses.`);
    } else {
        console.log(`Mission was successful.`);
    }
}