function schoolCamp(data) {
    var season = data[0];
    var groupType = data[1];
    var countStud = Number(data[2]);
    var countNights = Number(data[3]);
    var totalPrice = 0;

    var pricesMap = {
        "boys": { "Winter": 9.60 },
        "girls": { "Winter": 9.60 },
        "mixed": { "Winter": 10 },
        "boys": { "Spring": 7.20 },
        "girls": { "Spring": 7.20 },
        "mixed": { "Spring": 9.50 },
        "boys": { "Summer": 15.00 },
        "girls": { "Summer": 15.00 },
        "mixed": { "Summer": 20.00 }
    };

    var activMap = {
        "boys": { "Winter": 'Judo' },
        "girls": { "Winter": 'Gymnastics' },
        "mixed": { "Winter": 'Ski' },
        "boys": { "Spring": 'Tennis' },
        "girls": { "Spring": "Athletics" },
        "mixed": { "Spring": 'Cycling' },
        "boys": { "Summer": 'Football' },
        "girls": { "Summer": 'Volleyball' },
        "mixed": { "Summer": 'Swimming' }
    };

    totalPrice = countNights * countStud * pricesMap[groupType][season];

    console.log(totalPrice);

}

schoolCamp(['Spring','girls','20','7']);