Circle of choirs

Circle of choirs

In a school operates a circle of choral singing. Start mug always happen consistently: the signal head mug all N participants are in a circle and every M-th for raspevki singing styles.

Head of the circle noticed that stretch the vocal chords is not always possible to all participants of the circle. For given N and M help him to define, or once again in the warm-up will be attended by all members of the choir.


The input file consists several cases. Each case contains two positive integers N and M. (1N, M103).


If everyone has a chance to sing, print "YES", else "NO".

Time limit 1 second
Memory limit 64 MiB
Input example
4 1
6 3

Output example
ТЕХнические проблемы