#![allow(unused)]
fn main() {
    let mut ret = !0 as usize;
    println!("{}", ret);
    let mut n = 1 as u64;
    let mut i = 0;
    while ret > 0 {
        i = i + 1;
        ret /= 2;
    }
    println!("{}", i);

    println!("{}, {:b}", 1, 1);
    println!("{}, {:b}", !1, !1);
}