You are given two integers $n$ and $k$.

In one operation, you can subtract any power of $k$ from $n$. Formally, in one operation, you can replace $n$ by $(n-k^x)$ for any non-negative integer $x$.

Find the minimum number of operations required to make $n$ equal to $0$.

Input

Each test contains multiple test cases. The first line contains the number of test cases $t$ ($1 \le t \le 10^4$). The description of the test cases follows.

The only line of each test case contains two integers $n$ and $k$ ($1 \le n, k \le 10^9$).

Output

For each test case, output the minimum number of operations on a new line.

见题面 Input 部分

见题面 Output 部分

In the first test case, $n = 5$ and $k = 2$. We can perform the following sequence of operations:

1. Subtract $2^0 = 1$ from $5$. The current value of $n$ becomes $5 - 1 = 4$.
2. Subtract $2^2 = 4$ from $4$. The current value of $n$ becomes $4 - 4 = 0$.

It can be shown that there is no way to make $n$ equal to $0$ in less than $2$ operations. Thus, $2$ is the answer.

In the second test case, $n = 3$ and $k = 5$. We can perform the following sequence of operations:

1. Subtract $5^0 = 1$ from $3$. The current value of $n$ becomes $3 - 1 = 2$.
2. Subtract $5^0 = 1$ from $2$. The current value of $n$ becomes $2 - 1 = 1$.
3. Subtract $5^0 = 1$ from $1$. The current value of $n$ becomes $1 - 1 = 0$.

It can be shown that there is no way to make $n$ equal to $0$ in less than $3$ operations. Thus, $3$ is the answer.