function smallShop([product, town, quantity]) {

    // Transform quantity to a number and convert the string to lowercase letters.
    quantity = Number(quantity)
    town = town.toLowerCase()
    product = product.toLowerCase()

    // Checking if the town is Sofia, Plovdiv or Varna.
    // Checking also for each town whether product is coffee, water, beer, sweats or peanuts. Then calculate the quantity by price.
    if (town == 'sofia') {
        if (product == 'coffee') {
            console.log(quantity * 0.5)
        } else if (product == 'water') {
            console.log(quantity * 0.8)
        } else if (product == 'beer') {
            console.log(quantity * 1.2)
        } else if (product == 'sweets') { instead of sweats
            console.log(quantity * 1.45)
        } else if (product == 'peanuts') {
            console.log(quantity * 1.6)
        }

    } else if (town == 'plovdiv') {
        if (product == 'coffee') {
            console.log(quantity * 0.4)
        } else if (product == 'water') {
            console.log(quantity * 0.7)
        } else if (product == 'beer') {
            console.log(quantity * 1.15)
        } else if (product == 'sweets') { instead of sweats
            console.log(quantity * 1.3)
        } else if (product == 'peanuts') {
            console.log(quantity * 1.5)
        }

    } else if (town == 'varna') {
        if (product == 'coffee') {
            console.log(quantity * 0.45)
        } else if (product == 'water') {
            console.log(quantity * 0.7)
        } else if (product == 'beer') {
            console.log(quantity * 1.1)
        } else if (product == 'sweets') { instead of sweats
            console.log(quantity * 1.35)
        } else if (product == 'peanuts') {
            console.log(quantity * 1.55)
        }
    }
}