program sucin (input, output);
var a,s : integer;
begin
s := 1;
writeln ('zadavaj cisla postupnosti (koniec je 7)');
repeat
write ('zadaj a: ');
readln (a);
if a <> 7 then s := s * a;
until a = 7;
writeln ('sucin cisel postupnosti je ', s);
readln;
end.