use proconio::input;

fn main(){
    input!{
        t: usize,
    }
    for _ in 0..t{
        input!{
            n: usize,
            f: [usize; n],
        }
        let ans = (n-f.iter().sum::<usize>()+1)%(n+1);
        println!("{}", ans);
    }
}