#include <stdio.h>
  
main() 
{
  int x;
  
  printf("your score = ");
  scanf("%d", &x);
  if (x >= 80) {
    printf("You succeeded! Grade A\n");
  } else if (x >= 60) {
    printf("You succeeded! Grade B\n");
  } else {
    printf("You failed.\n");
  }
}