n,m=map(int,raw_input().split())
w=map(int,raw_input().split())
if m==0:print 0;quit()
if m==n:print sum(w);quit()
def f(s):
	D={(m-s,s):0}
	for i in xrange(n-1):
		T={}
		for (k,h),v in D.iteritems():
			for l in xrange(2):
				if 0<=k-l<n-1-i:
					nk=(k-l,l);nv=v+w[i]*h*l
					if nk not in T or T[nk]<nv:T[nk]=nv
		D=T
	return max(v+w[n-1]*h*s for(k,h),v in D.iteritems())
print max(f(0),f(1))