CF320A.Magic Numbers

A magic number is a number formed by concatenation of numbers $1$ , $14$ and $144$ . We can use each of these numbers any number of times. Therefore $14144$ , $141414$ and $1411$ are magic numbers but $1444$ , $514$ and $414$ are not.

You're given a number. Determine if it is a magic number or not.

The first line of input contains an integer $n$ , $(1<=n<=10^{9})$ . This number doesn't contain leading zeros.

Print "YES" if $n$ is a magic number or print "NO" if it's not.