use proconio::input;

fn main() {
    input! {
        n:usize,
        a:[usize;n],
    }

    const D: usize = 16;
    if n >= D {
        let ans = (1 << 16) - 1;
        println!("{}", ans);
        return;
    }

    let mut dp = vec![vec![false; 1 << D]; n + 1];
    dp[0][0] = true;
    for i in 0..n {
        for j in 0..1 << D {
            if !dp[i][j] {
                continue;
            }
            let mut x = a[i];
            for _ in 0..D {
                dp[i + 1][j | x] = true;
                x = shift(x);
            }
        }
    }

    for i in (0..1 << D).rev() {
        if dp[n][i] {
            let ans = i;
            println!("{}", ans);
            return;
        }
    }
}

fn shift(x: usize) -> usize {
    if x & 1 == 0 {
        x >> 1
    } else {
        (x >> 1) | (1 << 15)
    }
}