PersonalCorpus 版 (精华区)
157571 11:19:37 8 Mar 2002
Bozhang,HIT,P.R.China 1023 Pascal Accepted 0.02 sec 49K
var
i,k:integer;
begin
readln(K);
for i:=3 to 10000 do if (k mod i)=0 then begin k:=i; break end;
write(k-1);
end.
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