debug a program

import java.util.Scanner;

public class Program {
        public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                int seconds;
                System.out.println("How many seconds until liftoff?");
                seconds = sc.nextInt();

                while(seconds > 0) {
                        System.out.println(seconds + "!");
                        if(seconds == 1);
                                System.out.println("Blastoff!");
                }
        }
}