def query(i):
    print(f'? {i}')
    res = int(input())
    return res


N = int(input())
lo = 1
hi = N
d = {}
ans = None
for _ in range(10):
    m = (lo + hi) // 2
    res = query(m)
    if res in d:
        ans = sorted([m, d[res]])
        continue

    d[res] = m
    if res < m:
        hi = m-1
    else:
        lo = m+1

if ans is None:
    assert False
    print('No')
    exit()

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