How to sort four numbers without using loops and only using if statements?

So I have two assignments in Java class:

1) Sort 3 numbers in ascending order using only "three" if statements. 2) Sort 4 numbers in ascending order using only "five" if statements.

I was able to do the first one with the following code. However, I have no idea how to do the 2nd one. How do I do that with only 5 if statements??? And even the first one, I have a feeling that it is not so efficient. Any help is very much appreciated. Thank you.

 // First Problem Solution
 public class Assignment_1 {

        public static void main(String[] args) {

            int a = Integer.parseInt("12");
            int b = Integer.parseInt("7");
            int c = Integer.parseInt("8");


            if (a<b && a<c) {
                a = a;
                if (b < c) {
                    b = b;
                    c=c;
                }
                else {
                    int temp =b;
                    b = c;
                    c= temp;
                }

            }

            if (b<a && b<c) {
                int temp = b;
                if (a < c) {
                    b = a;
                    c = c;
                }
                else {
                    b=c;
                    c=a;

                }
                a = temp;
            }

            if (c<a && c<b) {
                int temp = c;
                if (a < b) {
                    b = a;
                    c = b;
                }
                else {
                    b = b;
                    c = a;
                }
                a = temp;

            }

            StdOut.println(a + " " + b + " " + c);

        }

    }