#int(input())
#map(int, input().split())
#list(map(int, input().split()))

T = int(input())

K = [0] * T

for i in range(T):
    K[i] = list(map(int, input().split()))

ans = [0] * T
for i in range(T):
    n = K[i][0]
    m = K[i][1]
    k = K[i][2]

    a = k % m
    if m - n <= a:
        ans[i] = 0
    else:
        ans[i] = a

for i in range(T):
    print(ans[i])