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- #include <bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long a,b,c,d,e,f,i,j,k,l;
- cin>>a;
- while(a>0)
- {
- if(a%10!=1 && a%100!=14 && a%1000!=144)
- {
- cout<<"NO\n";
- return 0;
- }
- a=a/10;
- }
- cout<<"YES\n";
- return 0;
- }
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