You are given two integers $x$ and $y$. You can perform two types of operations:

1. Pay $a$ dollars and increase or decrease any of these integers by $1$. For example, if $x = 0$ and $y = 7$ there are four possible outcomes after this operation:
   • $x = 0$, $y = 6$;
   • $x = 0$, $y = 8$;
   • $x = -1$, $y = 7$;
   • $x = 1$, $y = 7$.

2. Pay $b$ dollars and increase or decrease both integers by $1$. For example, if $x = 0$ and $y = 7$ there are two possible outcomes after this operation:
   • $x = -1$, $y = 6$;
   • $x = 1$, $y = 8$.

Your goal is to make both given integers equal zero simultaneously, i.e. $x = y = 0$. There are no other requirements. In particular, it is possible to move from $x=1$, $y=0$ to $x=y=0$.

Calculate the minimum amount of dollars you have to spend on it.

The first line contains one integer $t$ ($1 \le t \le 100$) — the number of testcases.

The first line of each test case contains two integers $x$ and $y$ ($0 \le x, y \le 10^9$).

The second line of each test case contains two integers $a$ and $b$ ($1 \le a, b \le 10^9$).

For each test case print one integer — the minimum amount of dollars you have to spend.