#include<iostream>
using namespace std;
int main(){
int n;
cin>>n;
while( n != 0 ){
if ( n % 10 == 1) n /= 10 ;
else if(n%100 == 14) n/= 100;
else if(n%1000 == 144) n/= 1000;
else break;
}
if( n == 0 )cout<<"YES";
else cout<<"NO";
}
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