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

ub = n+1 #n # NG
lb = 0 #0 # OK
arub = n
arlb = 0
tim = 0
while ub - lb > 1:
	t = (ub + lb) // 2
	print(f"? {t}")
	tim += 1
	x = int(input())

	if arub - x < ub - t:
		lb = t
		arlb = x
	else:
		ub = t
		arub = x

assert tim <= 10
while tim < 10:
	print(f"? {1}")
	x = int(input())
	tim += 1

print("Yes",lb,lb+1)