N = int(input())
left = 1
right = N
for _ in range(10):
    if right - left == 1:
        break

    mid = (left + right) >> 1
    print("?", mid)
    x = int(input())
    if x >= mid:
        left = mid
    else:
        right = mid

if right - left == 1:
    print("Yes", left, right)
else:
    print("No")