So far so good. You asked the user to enter the number N and you already read it.
The next step is to repeat reading N numbers. For that you should use a loop (for, while or do-while). In this loop, you ask for the numbers one by one (just like you did for N -- number -- above).
When done, you should look for duplicates. I leave this for you for think about how to do it. (There could be many ways).
I've created the skeleton of the program. Please, give it a try and try to fill the missing parts.
// Instructions to the user + asking for N
printf("The program will read N number of integers then find duplicates in them.\n");
printf("Please, enter N (how many numbers you'll want to check for duplicates): ");
int numbers[count]; // Now, that we know how many numbers we need, we can initialise the numbers array for the right count of elements
// Reading the N numbers
for (int i = 0; i < count; i++)
// TODO: Implement reading the numbers
// 1. Ask the user to enter the "i"th number.
// 2. Read the number and store it in the "numbers" array.
// Note: you can access the "i"th element of the array "numbers" as: numbers[i]
// Searching for duplicates
// TODO: Implement searching for duplicates
// 1. Find a duplicate.
// 2. Print it to the user.
// 3. Go back to 1. or finish, when there are no numbers left.
If you get stuck, please come back and I (or others) will be more than happy to help.
Good luck! :)