1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
1 2 3 4 5 6 7 if for else while 1 2 3 if 4 5 0 for 6 7 8 else 9 10 11 while 1 2 3 if 4 5 0 for 6 7 8 else 9 10 11 while 0 0 0