def query(n):
    print("?", n, flush=True)
    return int(input())

N = int(input())
ans = [-1] * (N + 1)
ans[-1] = N - 1
l, r = 0, N
for i in range(10):
    mid = (l + r) // 2
    ans[mid] = query(mid)
    if ans[r] - ans[mid] == r - mid:
        r = mid
    else:
        l = mid
        
for i in range(N):
    if ans[i] == ans[i + 1] and ans[i] != -1:
        print("Yes", i, i+1)
        exit()