var a,b,k,i:integer;beginreadln(a,b,k);if a/12>b then i:=(a div 12)+1 else i:=b;writeln('Cena - ',k*i);end.
var a,b,k,i:integer;
begin
readln(a,b,k);
if a/12>b then i:=(a div 12)+1 else i:=b;
writeln('Cena - ',k*i);
end.