from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    T = int(input())
    ABC = [list(map(int, input().split())) for _ in [0] * T]

    for abc in ABC:
        ans = 0
        while 1:
            if abc.count(1) == 2 or max(abc) < 3:
                print(-1)
                break
            if abc[0] != abc[2] and (abc[0] < abc[1] > abc[2] or abc[0] > abc[1] < abc[2]):
                print(ans)
                break
            if abc[0] == abc[2]:
                abc[0] -= 1
                ans += 1
                continue
            center = max(0, abc[1] - min(abc) + 1)
            left = max(0, abc[0] - abc[1] + 1)
            right = max(0, abc[2] - abc[1] + 1)
            if center <= left + right:
                abc[1] -= center
                ans += center
            else:
                abc[0] -= left
                abc[2] -= right + 1
                ans += left + right + 1
            if abc.count(0):
                print(-1)
                break


main()