use std::io::Read;

fn main() {
	let mut s = String::new();
	std::io::stdin().read_to_string(&mut s).ok();
	let v: Vec<u64> =
		s.split_whitespace().skip(1).flat_map(str::parse).collect();
	for n in v.chunks(3) {
		let a = n[2] % n[1];
		println!("{}", if a < n[1] - n[0] { a } else { 0 })
	}
}