#include <cstdio>
#include <cstring>

#define file_in "ferma.in"
#define file_out "ferma.out"

#define Nmax 10010
#define Kmax 1001
#define Inf 0x3f3f3f3f

int N,K;
int i,j,k,ind;
int P[Kmax];
int S[2][2][Kmax];

inline int max(int a, int b) { return a>b?a:b; }
inline int abs(int a) { return a>=0?a:-a; }

int main()
{
	freopen(file_in,"r",stdin);
	freopen(file_out,"w",stdout);
	
	scanf("%d %d", &N, &K);
	for (i=1;i<=N;++i)
	{
		scanf("%d", &P[i]);
	}
	
	for (i=0;i<=K;++i)
	{
		S[ind][0][i]=-Inf;
		S[ind][1][i]=-Inf;
	}
	S[0][0][0]=0;
	
	ind=1;
	for (i=1;i<=N;++i)
	{
		ind^=1;
		S[ind^1][0][0]=S[ind][0][0];
		S[ind^1][1][0]=0;
		
		for (j=1;j<=K;++j)
		{
			S[ind^1][0][j]=max(S[ind][0][j],S[ind][1][j]);
			S[ind^1][1][j]=P[i]+max(S[ind][1][j],max(S[ind^1][0][j-1],S[ind^1][1][j-1]));
		}
	}
	
	printf("%d", max(S[ind][0][K],S[ind][1][K]));
	
	
	fclose(stdin);
	fclose(stdout);
	
	return 0;
}