fn main() {
    let t = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        line.trim().parse::<usize>().unwrap()
    };

    for _ in 0..t {
        println!("{}", solve());
    }
}

fn solve() -> usize {
    let m = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        line.trim().parse::<usize>().unwrap()
    };
    let dd: Vec<_> = {
        let mut line = String::new();
        std::io::stdin().read_line(&mut line).unwrap();
        line.split_whitespace()
            .map(|x| x.parse::<usize>().unwrap())
            .collect()
    };

    if dd.iter().all(|&d| d == 0) {
        return m;
    }

    let mut upper_digits = 0;
    for (i, &d) in dd.iter().enumerate() {
        for _ in 0..d {
            upper_digits = 10 * upper_digits + i + 1;
        }
    }
    upper_digits *= 10_usize.pow(9);

    upper_digits + (m - upper_digits % m) % m
}