// dfmt off
T lread(T=long)(){return readln.chomp.to!T;}T[] lreads(T=long)(long n){return iota(n).map!((_)=>lread!T).array;}
T[] aryread(T=long)(){return readln.split.to!(T[]);}void arywrite(T)(T a){a.map!text.join(' ').writeln;}
void scan(L...)(ref L A){auto l=readln.split;foreach(i,T;L){A[i]=l[i].to!T;}}alias sread=()=>readln.chomp();
void dprint(L...)(lazy L A){debug{auto l=new string[](L.length);static foreach(i,a;A)l[i]=a.text;arywrite(l);}}
static immutable MOD=10^^9+7;alias PQueue(T,alias l="b<a")=BinaryHeap!(Array!T,l);import std, core.bitop;
// dfmt on

void main()
{
    long N, K;
    scan(N, K);
    auto V = aryread();
    long ans;
    foreach (i; 0 .. N + 1)
        foreach (j; 0 .. N - i + 1)
        {
            long[] v = V[0 .. i] ~ V[$ - j .. $];
            long cnt = K - i - j;
            if (cnt < 0)
                continue;
            v.sort();
            long s;
            while (s < cnt && s < v.length && v[s] < 0)
                s++;
            dprint(i, j, v, cnt, s, v[s .. $].sum());
            ans = ans.max(v[s .. $].sum());
        }
    writeln(ans);
}
