public static void decentNumber(int n) {
        int numOfFives = n;
        while (numOfFives % 3 != 0) {
            numOfFives = numOfFives - 5;
        }
        if (numOfFives < 0) {
            System.out.println("-1");
        } else {
            System.out.println("5".repeat(numOfFives) + "3".repeat(n - numOfFives));
        }
    }

def decentNumber(n):
    three, five = '33333', '555'
    q3, r3 = divmod(n, 3)
    if r3 == 0: 
        return five * q3
    
    # decrements quotient of q3 and increments r3 to see if divisible by 5
    # this is done so that we get as many 5's as possible 
    while q3 > 0: 
        r3 += 3
        q3 -= 1         
        q, r = divmod(r3, 5)
        if r == 0: 
            return (five * q3) + (three * q)
    return -1

string main = "";
            if (n % 3 == 0)
            {
                for (int i = 0; i < n; i += 3)
                {
                    main += "555";
                }
                Console.WriteLine(main);
            }
            
            else
            {
                int saklananbasamak = n;
                while (n > 2)
                {
                    n -= 5;
                    if (n % 3 == 0)
                    {
                        for (int i = 0; i < n; i += 3)
                        {
                            main += "555";
                        }
                        for (int y = 0; y < saklananbasamak - n; y += 5)
                        {
                            main += "33333";
                        }
                        Console.WriteLine(main);
                        break;
                    }
                }
            }
            if (main.Length == 0)
                Console.WriteLine(-1);

def decentNumber(n):
    a, b = divmod(n, 3)
    if b == 0: return '5'*n
    if n<=7 and n%5: return -1
    threes = 5*(3-b)
    fives = n-threes
    return '5'*fives+'3'*threes