use proconio::input_interactive;

fn main() {
	input_interactive! {
        N: usize,
	}

    // if N == 2 {
    //     for i in 1 ..= 10 {
    //         println!("? {i}");
    //         input_interactive!(_: usize);
    //         println!("Yes 1 2");
    //         return;
    //     }
    // }
	
    let mut l = 1;
    let mut r = N;
    for _ in 1 ..= 10 {
        let mid = (l + r + 1) / 2;
        println!("? {}", mid);
        input_interactive!(count: usize);
        if count >= mid {
            l = mid;
        } else {
            r = mid;
        }
    }

    println!("Yes {l} {r}");
}