#include "bits/stdc++.h"
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> veci;
typedef vector<string> vecs;
template<class T,class U> using Hash=unordered_map<T,U>;

#define REP(i, a, n) for(ll i = a; i < n; i++)
#define RREP(i, a, n) for(ll i = n-1; i >= 0; i--)
#define rep(i, n) REP(i, 0, n)
#define rrep(i, n) RREP(i, 0, n)
#define MD 1000000007

void read(){}
template<class Head, class... Tail> void read(Head& head, Tail&... tail){cin >> head;read(tail...);}
template<class T> void rarr(T a, int n){for(int i = 0; i < n; i++) {cin >> a[i];}}
template<class T> void write(T a){cout << a << endl;}
template<class T> void writes(vector<T> a, const char* c = " "){cout << a[0];for(int i = 1; i < (int)a.size(); i++)cout << c << a[i];cout << endl;;}
void write(double a){cout << fixed << setprecision(12) << a << endl;}
template<class T> void warr(T a, int n, char* c = " "){cout << a[0];for(int i = 1; i < n; i++)cout << c << a[i];cout << endl;}
void split(string s, string delim, veci& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(atoi(s.substr(pos).data()));break;}else {result.push_back(atoi(s.substr(pos, p - pos).data()));}pos = p + delim.size();}}
void split(string s, string delim, vecs& result){result.clear();string::size_type pos = 0;while(pos != string::npos){string::size_type p = s.find(delim, pos);if(p == string::npos){result.push_back(s.substr(pos));break;}else {result.push_back(s.substr(pos, p - pos));}pos = p + delim.size();}}
ll gcd(ll a, ll b){while(true){ll k = a % b;if(k == 0)return b;a = b;b = k;}}
ll comb(ll n, ll m){ll p=1;m=min(m,n-m);for(ll i=1;i<=m;i++){p*=n-i+1;p/=i;}return p;}

void calc(vector<int> &a,vector<ll> &a_id,vector<ll> &a_nm,int n){
    int xsum=0;
    rep(i,n){
        xsum^=a[i];
        a_id[xsum]++;
    }
    a_nm = a_id;
    rep(i,1024){
        REP(j,i,1024){
            ll t=a_id[i]*a_id[j];
            ll xo=i^j;
            if(j==i)t-=((a_id[i]+1)*a_id[i])/2;
            a_nm[xo]=(a_nm[xo]+t)%MD;
        }
    }
}
#define EMPTY_ ((ll)-1e17)
int main()
{
    int n,k,m;
    vector<ll> a;
    vector<vector<ll>> dp;
    read(n,k,m);
    a.resize(n);
    rep(i,n)read(a[i]);
    dp.resize(3010);
    rep(i,3010)dp[i].resize(3010,EMPTY_);
    dp[0][0]=0;
    rep(ii,k){
        int no_more=n-(k-ii-1);
        REP(jj,ii,no_more){
            double ln=(n-jj)/(double)(k-ii);
            //cout<<m<<" "<<ln<<" "<<no_more<<endl;
            if(m<ln)continue;
            if(dp[jj][ii]==EMPTY_)continue;
            ll sum=0;
            rep(kk,m){
                int jj_kk=jj+kk;
                if(jj_kk>=no_more)break;
                sum+=a[jj_kk];
                dp[jj_kk+1][ii+1]=max(dp[jj_kk+1][ii+1],dp[jj][ii]+abs(sum));
            }
        }
    }
    cout<<dp[n][k]<<endl;
    return 0;
}

// GCC reference:
//   https://gcc.gnu.org/

// C++ language references:
//   https://cppreference.com/
//   https://isocpp.org/
//   http://www.open-std.org/jtc1/sc22/wg21/

// Boost libraries references:
//   https://www.boost.org/doc/