Patrick and Shopping

题意翻译

平面上有三个点A,B,C 给出AB=$d_1$,AC=$d_2$,BC=$d_3$($1\le d_1,d_2,d_3\le 10^8)$ 求从A出发，经过B和C再回到A的最短路径长度（可重复经过点、边）

题目描述

Today Patrick waits for a visit from his friend Spongebob. To prepare for the visit, Patrick needs to buy some goodies in two stores located near his house. There is a $ d_{1} $ meter long road between his house and the first shop and a $ d_{2} $ meter long road between his house and the second shop. Also, there is a road of length $ d_{3} $ directly connecting these two shops to each other. Help Patrick calculate the minimum distance that he needs to walk in order to go to both shops and return to his house. Patrick always starts at his house. He should visit both shops moving only along the three existing roads and return back to his house. He doesn't mind visiting the same shop or passing the same road multiple times. The only goal is to minimize the total distance traveled.

输入输出格式

输入格式

The first line of the input contains three integers $ d_{1} $ , $ d_{2} $ , $ d_{3} $ ( $ 1<=d_{1},d_{2},d_{3}<=10^{8} $ ) — the lengths of the paths. - $ d_{1} $ is the length of the path connecting Patrick's house and the first shop; - $ d_{2} $ is the length of the path connecting Patrick's house and the second shop; - $ d_{3} $ is the length of the path connecting both shops.

输出格式

Print the minimum distance that Patrick will have to walk in order to visit both shops and return to his house.

输入输出样例

输入样例 #1

10 20 30

输出样例 #1

60

输入样例 #2

1 1 5

输出样例 #2

4

说明

The first sample is shown on the picture in the problem statement. One of the optimal routes is: house  first shop  second shop  house. In the second sample one of the optimal routes is: house  first shop  house  second shop  house.