package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
	"strings"
)

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Scan()
	T, _ := strconv.Atoi(sc.Text())
	for t := 0; t < T; t++ {
		sc.Scan()
		ss := strings.Fields(sc.Text())
		N, _ := strconv.Atoi(ss[0])
		M, _ := strconv.Atoi(ss[1])
		K, _ := strconv.Atoi(ss[2])

		a := K % M
		if N >= M-a {
			a = 0
		}
		fmt.Println(a)
	}
}