SmartLili

function solve(input) {
    let liliAge = Number(input.shift());
    let washingMachinePrice = Number(input.shift());
    let toyCount = 0;
    let toyPrice = Number(input.shift());
    let sum = 10;
    let totalSum = 0;
    for(let i = 1; i <= liliAge; i++){
        if (i % 2 == 1){
          toyCount++;
        }else{
          totalSum += sum;
          sum += 10;
          totalSum -= 1;
        }

    }
    totalSum += (toyCount * toyPrice)
    let m = totalSum - washingMachinePrice;
    let nn = washingMachinePrice - totalSum;
    if(washingMachinePrice < totalSum){
        console.log(`Yes! ${m.toFixed(2)}`)
    }else{
        console.log(`No! ${nn.toFixed(2)}`)
    }
}
solve([21,
    1570.98,
    3])