Statement

Evil George has kidnapped the princess. Now Drogo the dragon comes to rescue her. George prefers challenging the dragon intellectually rather than fighting him, so he tells Drogo: Can you help the dragon to solve this challenge and save the princess? Beware, George might be so evil that there is no possible answer! Note: the greatest common divisor of two positive integer numbers A and B is the greatest integer k such that both A and B are multiples of k.