Sammo the frog has to visit his doctor who lives
on the white lilypad.
Sammo would like to hop right over there.
He can hop back and forth along the line of lilypads, but he was
injured in a karate contest and can only hop with one leg at a time.
(Thatís why he wants to see his doctor.) If he hops with his right
leg, he always lands exactly 11 lilypads away. If he hops with his
left he always lands exactly 7 lilypads away. As you can see, his
doctorís lilypad is exactly 5 lilypads away.
If he hops 11 forward and 7 backward, he just misses the doctorís
How can Sammo hop to his doctorís lilypad?