package main

import . "fmt"
import . "os"
import bf "bufio"

func main() {
	rd:=bf.NewReader(Stdin)
	var t int
	Fscan(rd,&t)
	for ;t>0;t-- {
		var n,m,k int
		Fscan(rd,&n,&m,&k)
		k%=m
		if k>=m-n {
			Println(0)
		} else {
			Println(k)
		}
	}
}