第 044 场 AtCoder Beginner Contest
Tak 与酒店（ABC 改编版）AI (CI翻译)
Problem Statement
题目描述
AI (CI翻译)There is a hotel with the following accommodation fee:
这家酒店的住宿费用如下：AI (CI翻译)
$X$yen (the currency of Japan) per night, for the first$K$nights$Y$yen per night, for the$(K+1)$-th and subsequent nights
- 前
$K$晚每晚$X$日元（日本的货币） - 从第
$(K+1)$晚开始，每晚$Y$日元
Tak is staying at this hotel for $N$ consecutive nights. Find his total accommodation fee.
Tak 将在这家酒店连续住宿 $N$ 晚。请计算他的住宿总费用。AI (CI翻译)
Constraints
约束条件
AI (CI翻译)$1 \leq N, K \leq 10000$$1 \leq Y < X \leq 10000$$N,\,K,\,X,\,Y$are integers.
$1 \leq N, K \leq 10000$$1 \leq Y < X \leq 10000$$N,\,K,\,X,\,Y$均为整数。
Input
输入格式
AI (CI翻译)The input is given from Standard Input in the following format:
输入从标准输入中按以下格式给出：AI (CI翻译)
N
K
X
YN
K
X
YOutput
输出格式
AI (CI翻译)Print Tak's total accommodation fee.
输出 Tak 的住宿总费用。AI (CI翻译)
样例
Input #1
5
3
10000
9000
Output #1
48000
The accommodation fee is as follows:
- $10000$ yen for the $1$-st night
- $10000$ yen for the $2$-nd night
- $10000$ yen for the $3$-rd night
- $9000$ yen for the $4$-th night
- $9000$ yen for the $5$-th night
Thus, the total is $48000$ yen.
Input #2
2
3
10000
9000
Output #2
20000
题目信息
题面与样例版权归 AtCoder 及出题人所有；中文翻译由 AI 生成（gpt-6.1-sol），如有出入请以原文为准。