const _INPUT: &str = "3,4,1,5";
const INPUT: &str = "63,144,180,149,1,255,167,84,125,65,188,0,2,254,229,24";

const SIZE: usize = 256;

fn main() {
    let mut circle: Vec<usize> = (0..SIZE).collect();
    let mut pos = 0;
    let mut skip_size = 0;

    for length in INPUT.split(',').map(|n| n.parse::<usize>().unwrap()) {
        for i in 0..length / 2 {
            circle.swap((pos + i) % SIZE, (pos + length - 1 - i) % SIZE);
        }

        pos += length + skip_size;
        skip_size += 1;
    }

    println!("{}", circle[0] * circle[1]);
}