How to enter if statement inside a for loop?

I'm trying calculate the average of 5 numbers, all of them being lower than 10. Any help would be much appreciated since I'm still very much in the early stages of learning.

int num1, num2;
  int sum, i;
  float average;

  printf ("Enter five numbers to calculate the average:");

  for (i = 0; i < 5; i++){
      scanf ("%d", num1);

      if (num1 > 10){
      printf ("You can't enter this number\n");
      printf ("Enter five numbers to calculate the average:");
      scanf ("%d", num1);
    }
    else{
        num1=num2;
    }
    sum += num2;
  }

  average = sum / 5;
  printf ("Average is: %f", average);