#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll = long long;
constexpr ll e(){return 1ll << 60;}
constexpr ll op(ll lhs, ll rhs){ return min(lhs, rhs); }

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, b, c;
    cin >> n >> b >> c;
    ll tot = 0;
    vector<ll> tmp(n + c, e());
    fill(tmp.begin(), tmp.begin() + c, 0);
    atcoder::segtree<ll, op, e> seg(tmp);
    int v;
    for(int i = c; i < c + n; i++){
        cin >> v;
        tot += v;
        ll pr = seg.prod(i - c, i);
        seg.set(i, pr + v);
    }
    cout << tot - seg.prod(max(0, n), n + c) << '\n';
}