#include <stdio.h>

enum {
  NO_ERROR = 0,
  INVALID_OPERATION = 10,
  INVALID_VALUE = 11,
  STACK_OVERFLOW = 12,
  STACK_UNDERFLOW = 13,
  OUT_OFF_MEMORY = 14
};

int main(void) {
  printf("%d\n%d\n",NO_ERROR, OUT_OFF_MEMORY);
  return 0;
}