# a[i] = i
n = int(input())

ub = n+1 # OK
lb = 1 # NG
while ub - lb > 1:
	t = (ub + lb) // 2
	print(f"? {t}")
	x = int(input())
	if x >= t:
		lb = t
	else:
		ub = t
print("Yes",lb,lb+1)