April Fools' Problem (easy)
题目描述
The marmots have prepared a very easy problem for this year's HC2 — this one. It involves numbers n, k and a sequence of n positive integers a1,a2,...,an. They also came up with a beautiful and riveting story for the problem statement. It explains what the input means, what the program should output, and it also reads like a good criminal.
However I, Heidi, will have none of that. As my joke for today, I am removing the story from the statement and replacing it with these two unhelpful paragraphs. Now solve the problem, fools!
The first line of the input contains two space-separated integers n and k (1≤k≤n≤2200). The second line contains n space-separated integers a1,...,an (1≤ai≤104).
Output one number.
8 5
1 1 1 1 1 1 1 1
5
10 3
16 8 2 4 512 256 32 128 64 1
7
5 1
20 10 50 30 46
10
6 6
6 6 6 6 6 6
36
1 1
100
100
题目来源：fps-www.educg.net-codeforce-1-2833.xml.zip；FPS 共享题包，题包内第 205 题。保留原作者与原赛事署名。