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public class JavaCore_2_4_8 {
    public static void main(String[] args) {
        System.out.println(determineGroup(66));
    }

    public static int determineGroup(int age) {
        if (age >= 7 && age <=13) {
            return 1;
        } else if (age >= 14 && age <=17) {
            return 2;
        } else if (age >= 18 && age <= 65) {
            return 3;
        }
        return -1;
    }
}