function solution(input) {
    let product = (input.shift());
    let city = (input.shift());
    let quantity = Number(input.shift());
    let totalSum = 0;
    if (product === 'coffee') {
        if (city === 'Sofia') {
            totalSum = quantity * 0.50;
        } else if (city === 'Plovdiv') {
            totalSum = quantity * 0.40;
        } else {
            totalSum = quantity * 0.45;
        }
    } else if (product === 'water') {
        if (city === 'Sofia') {
            totalSum = quantity * 0.80;
        } else if (city === 'Plovdiv') {
            totalSum = quantity * 0.70;
        } else {
            totalSum = quantity * 0.70;
        }
    } else if (product === 'beer') {
        if (city === 'Sofia') {
            totalSum = quantity * 1.20;
        } else if (city === 'Plovdiv') {
            totalSum = quantity * 1.15;
        } else {
            totalSum = quantity * 1.10;
        }
    } else if (product === 'sweets') {
        if (city === 'Sofia') {
            totalSum = quantity * 1.45;
        } else if (city === 'Plovdiv') {
            totalSum = quantity * 1.30;
        } else {
            totalSum = quantity * 1.35;
        }
        if (city === 'Sofia') {
            totalSum = quantity * 1.60;
        } else if (city === 'Plovdiv') {
            totalSum = quantity * 1.50;
        } else {
            totalSum = quantity * 1.55;
        }
    } else {

    }
    console.log(totalSum);
}

solution([
    'water',
    'Plovdiv',
    '3'

]);