program ideone;
var a, n, i, mx: integer; {от -32767 до 32768}
begin
	mx := -32767;
	read(n);
 
	for i:= 1 to n do
	begin
		readln(a);
		if (mx < a) and (a mod 5 = 0) then
			mx := a;
	end;
 
	writeln(mx);
end.
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