AT_abc465_b.Parking 2

There is a parking lot. The fee for parking in this lot is as follows:

• During the period from exactly $L$ o'clock to exactly $R$ o'clock, a fee of $X$ is charged for each hour parked.
• During the period not covered above, a fee of $Y$ is charged for each hour parked.

If a car is parked in this lot from exactly $A$ o'clock to exactly $B$ o'clock without crossing midnight, how much is the fee?

有一个停车场。该停车场的停车费用规则如下：

• 在恰好从 $L$ 点到恰好 $R$ 点的时段内，每停车一小时收费 $X$；
• 在上述时段之外的时段内，每停车一小时收费 $Y$。

若一辆汽车在该停车场中恰好从 $A$ 点停至恰好 $B$ 点，且不跨午夜，那么总费用是多少？

The input is given from Standard Input in the following format:

$X$ $Y$ $L$ $R$ $A$ $B$

输入从标准输入中按以下格式给出：

$X$ $Y$ $L$ $R$ $A$ $B$

Output the answer.

输出答案。

Sample 1 Explanation:
If a car is parked from $7$ o'clock to $21$ o'clock, the fee is as follows.

• For the $2$ hours from $7$ o'clock to $9$ o'clock, a fee of $300 \times 2 = 600$ is charged.
• For the $8$ hours from $9$ o'clock to $17$ o'clock, a fee of $700 \times 8 = 5600$ is charged.
• For the $4$ hours from $17$ o'clock to $21$ o'clock, a fee of $300 \times 4 = 1200$ is charged.

The answer is $600 + 5600 + 1200 = 7400$.

Sample 2 Explanation:
If a car is parked from $17$ o'clock to $20$ o'clock, the fee is as follows.

• For the $3$ hours from $17$ o'clock to $20$ o'clock, a fee of $500 \times 3 = 1500$ is charged.

The answer is $1500$.

Constraints

• $1 \leq X, Y \leq 1000$
• $1 \leq L < R \leq 23$
• $1 \leq A < B \leq 23$
• All input values are integers.

样例 1 解释：
若一辆汽车从 7 点停放到 21 点，费用计算如下：

• 从 7 点到 9 点的 2 小时，收费为 $300 \times 2 = 600$；
• 从 9 点到 17 点的 8 小时，收费为 $700 \times 8 = 5600$；
• 从 17 点到 21 点的 4 小时，收费为 $300 \times 4 = 1200$。

答案为 $600 + 5600 + 1200 = 7400$。

样例 2 解释：
若一辆汽车从 17 点停放到 20 点，费用计算如下：

• 从 17 点到 20 点的 3 小时，收费为 $500 \times 3 = 1500$。

答案为 $1500$。

约束条件

• $1 \leq X, Y \leq 1000$
• $1 \leq L < R \leq 23$
• $1 \leq A < B \leq 23$
• 所有输入值均为整数。