CF876A.Trip For Meal

普及/提高-

通过率：0%

AC君温馨提醒

该题目为【codeforces】题库的题目，您提交的代码将被提交至codeforces进行远程评测，并由ACGO抓取测评结果后进行展示。由于远程测评的测评机由其他平台提供，我们无法保证该服务的稳定性，若提交后无反应，请等待一段时间后再进行重试。

题目描述

Winnie-the-Pooh likes honey very much! That is why he decided to visit his friends. Winnie has got three best friends: Rabbit, Owl and Eeyore, each of them lives in his own house. There are winding paths between each pair of houses. The length of a path between Rabbit's and Owl's houses is $a$ meters, between Rabbit's and Eeyore's house is $b$ meters, between Owl's and Eeyore's house is $c$ meters.

For enjoying his life and singing merry songs Winnie-the-Pooh should have a meal $n$ times a day. Now he is in the Rabbit's house and has a meal for the first time. Each time when in the friend's house where Winnie is now the supply of honey is about to end, Winnie leaves that house. If Winnie has not had a meal the required amount of times, he comes out from the house and goes to someone else of his two friends. For this he chooses one of two adjacent paths, arrives to the house on the other end and visits his friend. You may assume that when Winnie is eating in one of his friend's house, the supply of honey in other friend's houses recover (most probably, they go to the supply store).

Winnie-the-Pooh does not like physical activity. He wants to have a meal $n$ times, traveling minimum possible distance. Help him to find this distance.

输入格式

First line contains an integer $n$ ( $1<=n<=100$ ) — number of visits.

Second line contains an integer $a$ ( $1<=a<=100$ ) — distance between Rabbit's and Owl's houses.

Third line contains an integer $b$ ( $1<=b<=100$ ) — distance between Rabbit's and Eeyore's houses.

Fourth line contains an integer $c$ ( $1<=c<=100$ ) — distance between Owl's and Eeyore's houses.

输出格式

Output one number — minimum distance in meters Winnie must go through to have a meal $n$ times.

输入输出样例

输入#1
```
3
2
3
1
```
输出#1
```
3
```
输入#2
```
1
2
3
5
```
输出#2
```
0
```

说明/提示

In the first test case the optimal path for Winnie is the following: first have a meal in Rabbit's house, then in Owl's house, then in Eeyore's house. Thus he will pass the distance $2+1=3$ .

In the second test case Winnie has a meal in Rabbit's house and that is for him. So he doesn't have to walk anywhere at all.

首页