fn bon_appetit(bill: &[i32], k: i32, b: i32) {
    let _k = k as usize;
    let out = match bill.iter()
        .enumerate()
        .filter_map(|(i, x)| if i != _k {Some(*x)} else {None})
        .sum::<i32>()
        .wrapping_div(2)
        .wrapping_sub(b)
        .abs() {
            0 => "Bon Appetit".to_string(),
            x => x.to_string()
        };
    println!("{out}")
}