from collections import defaultdict,deque
import sys,heapq,bisect,math,itertools,string,queue,copy,time
sys.setrecursionlimit(10**8)
INF = float('inf')
mod = 10**9+7
eps = 10**-7
def inp(): return int(sys.stdin.readline())
def inpl(): return list(map(int, sys.stdin.readline().split()))
def inpl_str(): return list(sys.stdin.readline().split())

Q = inp()

for q in range(Q):
    A,B,C = inpl()
    if C == 1:
        print(A*B)
    else:
        ans = 0
        while A > 1:
            if A%C == 0:
                A //= C
            else:
                A -= A%C
            ans += B
        print(ans)