{
    let purchase1 = 500, purchase2 = 60000, purchase3 = 2500;
    let cashback1, cashback2, cashback3;
    // Вычисляем первый кэшбек
    if(purchase1 <= 3000)
        {
            if(purchase1 <= 1000)
                cashback1 = purchase1 * 0.15;
            else cashback1 = purchase1 * 0.1;
        }
    else cashback1 = purchase1 * 0.05;
    if(cashback1 > 3000)
        cashback1 = 3000;

    // Вычисляем второй кэшбек
    if(purchase2 <= 3000)
        {
            if(purchase2 <= 1000)
                cashback2 = purchase2 * 0.15;
            else cashback2 = purchase2 * 0.1;
        }
    else cashback2 = purchase2 * 0.05;
    if(cashback2 > 3000)
        cashback2 = 3000;

    // Вычисляем третий кэшбек
    if(purchase3 <= 3000)
        {
            if(purchase3 <= 1000)
                cashback3 = purchase3 * 0.15;
            else cashback3 = purchase3 * 0.1;
        }
    else cashback3 = purchase3 * 0.05;
    if(cashback3 > 3000)
        cashback3 = 3000;

    let cashbackRez = cashback1 + cashback2 + cashback3 > 3000;
    if(cashbackRez > 3000)
        cashbackRez = 3000;

    console.log();
}