function birthdayParty(input){

let rent = Number(input[0]);

let cakePrice = rent * 0.20;
let drinksPrice = cakePrice - (cakePrice * 0.45)
let animatorPrice = rent / 3;

let sum = rent + cakePrice + drinksPrice + animatorPrice;
console.log(drinksPrice);

}
birthdayParty(["2250"])