How am i going to use while loop and if else if user enter the same input twice and it will try again

I want to apply this function in java. Inside while loop, you need to input number of repetition you want to input a number. if you input a number that equals to the number that you enter previously, it will repeat a loop and enter a number again. This code is not finish yet. I hope u understand what i want to achive. thank you

    System.out.print("Enter number of times: ");
    int times = number.nextInt();

    int i = 1;

    while ( i <= times){


        System.out.print("Enter a number : ");
        int input = number.nextInt();
        i++;
            if( input == input){
                System.out.println("It is already taken");
            }
    }
}

}