n = int(input())

ans = (0, 0)
cnts = [-1] * n
l, r = 1, n + 1
for _ in range(10):
    m = (l + r) // 2
    print(f"? {m}", flush=True)
    res = int(input())
    if ans[0] == 0 and cnts[res] != -1:
        ans = (cnts[res], m)

    cnts[res] = m
    if res < m:
        r = m
    else:
        l = m

print(f"Yes {ans[0]} {ans[1]}")