Bug in the addition drill program

Hi,
There is a bug in this addition drill program that I can't fix up. I can't input Y/N characters in this program. Is there anyone who can help me to fix it up?

Code:

---

#include <conio.h>
#include <stdio.h>

main()
{
 int answer, count;
 int ch;
 ch = getche();

 for(count=1; count<11; count++) {
  printf("What is %d + %d? ", count, count);
  scanf("%d", &answer);
  if(answer == count + count) printf("Right!\n");
  else{
  printf("Sorry, you're wrong\n");
  printf("Would you like to try again? Y/N: \n");
  scanf("%c", &ch);

  if(ch=='Y') {
    printf("\nWhat is %d + %d? ", count, count);
    scanf("%d", &answer);
    if(answer == count+count) printf("Right!\n");
    else
    printf("Wrong, the answer is %d\n", count+count);
    }

  else
    printf("The answer is %d\n", count+count);
  }
  }
  return 0;
 }

---

Thanks in advance

Please read this:fflush vs gets