public static void plusMinus(List<int> arr)
    {
        int p = 0, n = 0, z = 0, l = arr.Count;
        foreach(int el in arr)
        {
            if(el > 0)
                p++;
            else if(el < 0)
                n++;
            else if(el == 0)
                z++;
        };
        
        decimal pD = p, nD = n, zD = z;
        
        Console.WriteLine((pD/l).ToString("F6"));
        Console.WriteLine((nD/l).ToString("F6"));
        Console.WriteLine((zD/l).ToString("F6"));
    }