def inpl(): return list(map(int, input().split()))

for _ in range(int(input())):
    a, b, c = inpl()
    if c == 1:
        print(a*b)
        continue

    Q = []
    ans = 0
    
    while a:
        a, m = divmod(a, c)
        Q.append(m)

    if (len(Q) >= 2) & (Q[-1] == 1) & (1 <= Q[-2] <= c-2):
        ans += 3
        Q.pop()
        Q.pop()
    
    while Q:
        x = Q.pop()
        ans += 1 + (x > 0)
    
    print(b*(ans-1))