#line 1 "a.cpp"
#include <bits/stdc++.h>
// #include <boost/multiprecision/cpp_int.hpp>
using namespace std;
using std::cerr, std::cin, std::cout;
#define vec vector
#include <atcoder/all>
typedef long double ld;
#if LONG_MAX == 2147483647L
#undef long
#define long long long
#endif
#define uint unsigned int
#define ulong unsigned long
#define overload3(a, b, c, name, ...) name
#define rep3(i, a, b) for (int i = (a); i < (b); i++)
#define rep2(i, n) rep3(i, 0, n)
#define rep1(n) rep2(__i__, n)
#define rep(...) overload3(__VA_ARGS__, rep3, rep2, rep1)(__VA_ARGS__)
#define per3(i, a, b) for (int i = (b) - 1; i >= (a); i--)
#define per2(i, n) per3(i, 0, n)
#define per1(n) per2(__i__, n)
#define per(...) overload3(__VA_ARGS__, per3, per2, per1)(__VA_ARGS__)
#define all(a) a.begin(), a.end()
#define UNIQUE(a) sort(all(a)), a.erase(unique(all(a)), a.end()), a.shrink_to_fit()
#define sz(a) static_cast<int>(a.size())
#ifndef DEBUG
#define cerr \
	if (false) cerr
// #undef assert
// #define assert(...) void(0)
#undef endl
#define endl '\n'
#endif
ostream &operator<<(ostream &os, __int128_t value) {
	ostream::sentry s(os);
	if (s) {
		__uint128_t tmp = value < 0 ? -value : value;
		char buffer[128];
		char *d = std::end(buffer);
		do {
			--d;
			*d = "0123456789"[tmp % 10];
			tmp /= 10;
		} while (tmp != 0);
		if (value < 0) --d, *d = '-';
		const int len = std::end(buffer) - d;
		if (os.rdbuf()->sputn(d, len) != len) os.setstate(std::ios_base::badbit);
	}
	return os;
}
template <typename T, typename S>
ostream &operator<<(ostream &os, pair<T, S> a) {
	return os << a.first << ' ' << a.second;
};
template <typename T>
ostream &operator<<(ostream &os, vector<T> a) {
	const int n = a.size();
	rep(i, n) {
		os << a[i];
		if (i + 1 != n) os << " ";
	}
	return os;
}
template <typename T, typename S>
istream &operator>>(istream &is, pair<T, S> &a) {
	return is >> a.first >> a.second;
}
template <typename T, size_t n>
ostream &operator<<(ostream &os, array<T, n> a) {
	rep(i, n) {
		os << a[i];
		if (i + 1 != n) os << " ";
	}
	return os;
}
template <typename T>
istream &operator>>(istream &is, vector<T> &a) {
	for (T &i : a) is >> i;
	return is;
}
template <typename T, typename S>
bool chmin(T &x, S y) {
	if ((T)y < x) {
		x = (T)y;
		return true;
	}
	return false;
}
template <typename T, typename S>
bool chmax(T &x, S y) {
	if (x < (T)y) {
		x = (T)y;
		return true;
	}
	return false;
}
template <typename T>
void operator++(vector<T> &a) {
	for (T &i : a) ++i;
}
template <typename T>
void operator--(vector<T> &a) {
	for (T &i : a) --i;
}
template <typename T>
void operator++(vector<T> &a, int) {
	for (T &i : a) i++;
}
template <typename T>
void operator--(vector<T> &a, int) {
	for (T &i : a) i--;
}
void init(), solve();
int main() {
	// srand((unsigned)time(NULL));
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	cout << fixed << setprecision(20);
	cerr << fixed << setprecision(20);
	init();
	int t = 1;
	// cin >> t;
	while (t--) solve();
}
#define COMB_MAX 3e5 + 2022
// #include "lib/comb.hpp"
// #include "lib/fps.hpp"
// #include "lib/mint.hpp"
void init() {
	//	init_comb();
}
long op(long x, long y) { return min(x, y); }
constexpr long INF = 1e18;
long e() { return INF; }
void solve() {
	int n, _b, c;
	cin >> n >> _b >> c;
	vec<long> a(n);
	cin >> a;
	atcoder::segtree<long, op, e> seg(n + 1);
	seg.set(0, 0);
	long sum = 0;
	rep(i, n) {
		sum += a[i];
		seg.set(i + 1, a[i] + seg.prod(max(0, i + 1 - c), i + 1));
	}
	cout << sum - seg.prod(n - c + 1, n + 1) << endl;
}