#![allow(unused_imports, dead_code, unused_macros, unused_variables, non_snake_case, unused_parens)]
use proconio::{input,marker::{Bytes, Chars, Usize1,Isize1}};
use std::ops::*;
use std::cmp::*;
use std::mem::swap;
use std::collections::*;

const MOD:u64 = 1_000_000_007;
const INF:i64 = 0x3fff_ffff_ffff_ffff;
const YES:&str="Yes";const NO:&str="No";macro_rules!yesno{($var:expr) => {if $var{println!("{}",YES);}else{println!("{}",NO);}}}

macro_rules! min {($a:expr $(,)*) => {{$a}};($a:expr, $b:expr $(,)*) => {{std::cmp::min($a, $b)}};($a:expr, $($rest:expr),+ $(,)*) => {{std::cmp::min($a, min!($($rest),+))}};}
macro_rules! max {($a:expr $(,)*) => {{$a}};($a:expr, $b:expr $(,)*) => {{std::cmp::max($a, $b)}};($a:expr, $($rest:expr),+ $(,)*) => {{std::cmp::max($a, max!($($rest),+))}};}
macro_rules! chmin {($base:expr, $($cmps:expr),+ $(,)*) => {{let cmp_min = min!($($cmps),+);if $base > cmp_min {$base = cmp_min;true} else {false}}};}
macro_rules! chmax {($base:expr, $($cmps:expr),+ $(,)*) => {{let cmp_max = max!($($cmps),+);if $base < cmp_max {$base = cmp_max;true} else {false}}};}
macro_rules! mulvec {($x:expr; $s:expr) => {vec![$x; $s]};($x:expr; $s0:expr; $( $s:expr );+) => {mulvec![vec![$x; $s0]; $( $s );+ ]};}
macro_rules! outputln {($var:expr)=>{println!("{}",$var)};($var:expr,$($vars:expr),+)=>{print!("{} ",$var);outputln!($($vars),+);};}
macro_rules! debug {($($a:expr),* $(,)*) => {eprintln!(concat!($("| ",stringify!($a), "={:?} "),*, "|"),$(&$a),*);};}


fn solve() {
    input! {
        N: usize,
        K: usize,
		A: [i64; N],
    }
	let mut dp = mulvec![-INF; N+1; K+1; 2];
	dp[0][0][0] = 0;
	for i in 0..N {
		let a = A[i];
		for k in 0..=K {
			for b in 0..2 {
				if dp[b][k][i] == -INF {
					continue;
				}
				// 選ばない
				chmax!(dp[0][k][i+1], dp[b][k][i]);
				// 選ぶ
				if k < K && b == 0 {
					chmax!(dp[1][k+1][i+1], dp[0][k][i] + a);
				}
			}
		}
	}
	let ans = max!(dp[0][K][N], dp[1][K][N]);
	if ans == -INF {
		outputln!("Impossible");
	}else{
		outputln!(max!(dp[0][K][N], dp[1][K][N]));
	}

}

fn main() {
    std::thread::Builder::new()
        .stack_size(128 * 1024 * 1024)
        .spawn(|| solve()).unwrap()
        .join().unwrap();
}