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- program HelloWorld;
- var a: word;
- begin
- read (a);
- if ((a div 1000)>0) then a:=(a div 1000)+((a div 100) mod 10)+((a div 10) mod 10)+ (a mod 10)
- else if (((a div 100)>0) and ((a div 1000)=0)) then a:=(a div 100)+(a div 10 mod 10)+(a mod 10)
- else if (((a div 10)>0) and ((a div 100)=0)) then a:=(a div 10)+(a mod 10)
- else a:= a;
- write (a);
- end.
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