// expect: 3/
// spec 4.3
include rt;
void pn(int x) { rt.put_n(x); rt.put_c(10); }
fn main() {
	int n = 7;
	if (n < 3) pn(1); else if (n < 6) pn(2); else if (n < 9) pn(3); else pn(4);
	return 0;
}