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Cod sursa(job #291384)
var ok:boolean; f:text; xx,x,i,fact,n:longint;
begin
ok:=true;
assign(f,'fact.in');reset(f);read(f,x);close(f);
assign(f,'fact.out');rewrite(f);
xx:=1;
for i:=1 to x do
xx:=xx*10;
fact:=1;
while ok=true do begin
i:=i+1;
fact:=fact*i;
if fact mod xx=0 then begin ok:=false; end;
end; write(f,-1);
close(f);end.