301687: CF320A. Magic Numbers
Memory Limit:256 MB
Time Limit:2 S
Judge Style:Text Compare
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Submit:0
Solved:0
Description
Magic Numbers
题意翻译
魔数是由1,14,144组成的,每个数字可以重复使用,例如:14144,141414和1411就是魔数,而1444,514 和414就不是魔数。判断一个数是不是魔数。题目描述
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.输入输出格式
输入格式
The first line of input contains an integer $ n $ , $ (1<=n<=10^{9}) $ . This number doesn't contain leading zeros.
输出格式
Print "YES" if $ n $ is a magic number or print "NO" if it's not.
输入输出样例
输入样例 #1
114114
输出样例 #1
YES
输入样例 #2
1111
输出样例 #2
YES
输入样例 #3
441231
输出样例 #3
NO