N = int(input())

A = [-1]*(N+1)
left = 0
right = N+1
for _ in range(10):
    mid = (left+right)//2
    print("?", mid)
    n = int(input())
    A[mid] = n
    if n < mid:
        right = mid
    else:
        left = mid

D = dict()
for i in range(1, N+1):
    if A[i] == -1:
        continue
    if A[i] not in D:
        D[A[i]] = i
    else:
        print("Yes", D[A[i]], i)