Covering all scenarios with if statement

I'm doing the below homework exercise

Given 2 int values greater than 0, return whichever value is nearest to 21 without going over. Return 0 if they both go over.

I've made the below code

public static void main(String[] args) {


        System.out.println(blackjack(22,22));

        System.out.println(blackjack(25,25));

        System.out.println(blackjack(19,25));

        System.out.println(blackjack(25,19));

        System.out.println(blackjack(10,10));

        System.out.println(blackjack(19,10));

        System.out.println(blackjack(1,19));

    }

    // Create a method like:
    public static int blackjack(int a, int b){
        if ( a > 21 && b > 21){
            return 0;
        }
        else if ( a <= 21 || b > 21){
            return a;
        }
        else if ( a > 21 || b <= 21){
            return b;
        }
        else if ( a >= b){
            return a;
        }
        else {
            return b;
        }

    }

All of it works except the last line of output in my main. I keep getting "a" or, "1" in this case, so I'm not sure what is wrong with my last line in my method declaration. I have a feeling something is wrong but I'm not sure what to change.