#include<bits/stdc++.h>
#include<atcoder/all>
#define rep(i,b) for(int i=0;i<b;i++)
#define rrep(i,b) for(int i=b-1;i>=0;i--)
#define rep1(i,b) for(int i=1;i<b;i++)
#define repx(i,x,b) for(int i=x;i<b;i++)
#define fore(i,a) for(auto i:a)
#define fore1(i,a) for(auto &i:a)
#define rng(x) (x).begin(), (x).end()
#define rrng(x) (x).rbegin(), (x).rend()
#define sz(x) ((int)(x).size())
#define pb push_back
#define fi first
#define se second

using namespace std;
using namespace atcoder;

using ll = long long;
template<typename T> using mpq = priority_queue<T, vector<T>, greater<T>>;
template<typename T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<typename T> bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }
template<typename T> ll sumv(const vector<T>&a){ll res(0);for(auto&&x:a)res+=x;return res;}
bool yn(bool a) { if(a) {cout << "Yes" << endl; return 1;} else {cout << "No" << endl; return 0;}}
#define dame { cout << "No" << endl; return 0;}
#define dame1 { cout << -1 << endl; return 0;}
#define test(x) cout << "test" << x << endl;
#define deb(x,y) cout << x << " " << y << endl;
#define deb3(x,y,z) cout << x << " " << y << " " << z << endl;
#define deb4(x,y,z,x2) cout << x << " " << y << " " << z << " " << x2 << endl;
#define out cout << ans << endl;
#define outv fore(yans , ans) cout << yans << "\n";
#define show(x) cerr<<#x<<" = "<<x<<endl;
#define showv(v) {fore(vy , v) {cout << vy << " ";} cout << endl;}
#define showv2(v) fore(vy , v) cout << vy << "\n";
using pll = pair<ll,ll>;
using pil = pair<int,ll>;
using pli = pair<ll,int>;
using pii = pair<int,int>;
using tp = tuple<int ,int ,int>;
using vi = vector<int>;
using vl = vector<ll>;
using vs = vector<string>;
using vb = vector<bool>;
using vpii = vector<pii>;
using vpli = vector<pli>;
using vpll = vector<pll>;
using vpil = vector<pil>;
using vvi = vector<vector<int>>;
using vvl = vector<vector<ll>>;
using vvs = vector<vector<string>>;
using vvb = vector<vector<bool>>;
using vvpii = vector<vector<pii>>;
using vvpli = vector<vector<pli>>;
using vvpll = vector<vpll>;
using vvpil = vector<vpil>;
using mint = modint998244353;
using vm = vector<mint>;
using vvm = vector<vector<mint>>;
vector<int> dx={1,0,-1,0,1,1,-1,-1},dy={0,1,0,-1,1,-1,1,-1};
ll gcd(ll a, ll b) { return a?gcd(b%a,a):b;}
ll lcm(ll a, ll b) { return a/gcd(a,b)*b;}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;

int main(){
    ll n,m,l; cin>>n>>m>>l;

    vl a(n);
    rep(i,n) cin>>a[i];


    vb flg(n);

    vvpli v;

    rep(i,n){
        ll nxt = i;
        vpli tmp;

        ll now = i;

        while(!flg[nxt] && now <= n*m - 1){
            flg[nxt] = true;
            tmp.pb({a[nxt] , nxt});
            nxt += l;
            // now += l;
            nxt %= n;
        }

        if (sz(tmp)) v.pb(tmp);
    }

    ll ans = -LINF;

    rep(i,n) chmax(ans , a[i]);

    fore(y , v){
        int yn = sz(y);
        vl sum(yn);
        // show(yn);
        rep(i,yn){
            sum[i] = y[i].fi;
            if (i != 0) sum[i] += sum[i-1];
        }

        rep(i,yn){
            ll tmp = 0;
            bool ok = false;
            ll cnt = (m*n - y[i].se - 1)/l;
            cnt++;
            // deb(i , cnt);
            ll r =  cnt % yn;
            ll nr = i + r - 1;
            if (r != 0){
                ok = true;
                if (nr >= yn){
                    tmp += sum[yn-1] - sum[i-1];
                    tmp += sum[nr - yn];
                }else{
                    tmp += sum[nr];
                    if (i != 0) tmp -= sum[i-1];
                }
            }
            if (sum[yn-1] > 0){
                ok = true;
                tmp += sum[yn-1] * (cnt / yn);
            }

            if (ok) chmax(ans , tmp);
        }
    }

    out;

    return 0;
}