1#if 1 2. right 3 4# if 1 5.. right 6# elif 1 7.. wrong 8# elif 0 9.. wrong 10# else 11.. wrong 12# endif 13 14#elif 1 15. wrong 16 17# if 1 18.. wrong 19# elif 1 20.. wrong 21# elif 0 22.. wrong 23# else 24.. wrong 25# endif 26 27#elif 0 28. wrong 29 30# if 1 31.. wrong 32# elif 1 33.. wrong 34# elif 0 35.. wrong 36# else 37.. wrong 38# endif 39 40#else 41. wrong 42 43# if 1 44.. wrong 45# elif 1 46.. wrong 47# elif 0 48.. wrong 49# else 50.. wrong 51# endif 52 53#endif 54