use std::io;

fn main() {
    let mut n = String::new();
    io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();

    for _ in 0..n {
        let mut s = String::new();
        io::stdin().read_line(&mut s);
        let mut itr = s.trim().split_whitespace();
        let mut n: usize = itr.next().unwrap().parse().unwrap();
        let mut m: usize = itr.next().unwrap().parse().unwrap();
        let mut k: usize = itr.next().unwrap().parse().unwrap();

        let a = k % m;
        println!("{}",
            if a < m - n { a }
            else { 0 }
        );
    }
}