function solve(input) {

    let sum = 0;
    let sum2 = 0;
    let sum3 = 0;

    let input0 = Number(input[0]);
    let input1 = Number(input[1]);
    let input2 = Number(input[2]);
    let input3 = Number(input[3]);



                    // Kilograms
        // sum is the price for a given kilograms

    if (input1 < 10) {

         sum = input0 * (20 / 100); // This is the price up to 10kg.

    } else if (10 < input1 && input1 <= 20) {

         sum = input0 * (50 / 100); // This is the price between 10 and 20kg.

    } else if (input1 > 20) { // This is the price for above 20kg.

        sum = input0;

    }

                // Days
    // sum2 is the price increase given the days

    if (input2 > 30 ) {

        sum2 =  sum * (10 / 100); // The price beyond 30 days.

    } else if (7 <= input2 && input2 <= 30) {

        sum2 =  sum * (15 / 100); // The price between 7 and 30 days.

    } else if (input2 < 7) {

        sum2 =  sum * (40 / 100); // The price below 7 days.

    }

    //  sum3 is the result of the price for given kilograms and the the additional price for the given days

     sum3 = Number(sum) + Number(sum2);

    // total is the multiplication of the total sum that has to be paid for one baggage and the baggages that are stored

    let total = sum3 * input3;




    console.log('The total price of bags is: ' + total.toFixed(2) + ' lv.')
}