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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int i,len;
- string s;
- getline(cin,s);
- len=s.size();
- for(i=0;i<len;i++)
- {
- if(s[0]!='1')break;
- if(s[i]=='1')continue;
- if(s[i]=='4')
- {
- if(s[i+1]=='4' && s[i+2]=='4')break;
- }
- else break;
- }
- if(i<len)printf("NO\n");
- else printf("YES\n");
- return 0;
- }
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