function airp(input) {
    let above20 = Number(input[0])
    let kilograms = Number(input[1])
    let daystojourney = Number(input[2])
    let bagaj = Number(input[3])

    let price = 0
    let total = 0

    if (kilograms < 10) {           //here
        price = 0.2 * above20
    } else if (10 <= kilograms && kilograms <= 20) {            //here
        price = 0.5 * above20
    } else if (kilograms > 20) {            //here
        price = above20
    }

    if (daystojourney > 30) {
        price *= 1.1
    } else if (7 <= daystojourney && daystojourney <= 30) {         //here
        price *= 1.15
    } else {
        price *= 1.4
    }

    total = price * bagaj

    console.log(`The total price of bags is: ${total.toFixed(2)} lv.`);
}