#include <bits/stdc++.h>
#define fi first
#define se second
#define ll long long
#define pl pair<ll, ll>
#define pi pair<int, int>
#define minpq priority_queue<ll, vector<ll>, greater<ll>>
using namespace std;

#if 1
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '['; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "]";}
void _print() {cerr << endl << flush;}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#define debug(x...) cerr << "*["<<__LINE__<<"]\t"<< #x << " = "; _print(x)
#endif

const ll mod = 1e9 + 7;

template<typename T> bool chkmin(T &a, T b){return (b < a) ? a = b, 1 : 0;}
template<typename T> bool chkmax(T &a, T b){return (b > a) ? a = b, 1 : 0;}
ll gcd(ll a, ll b) {if(b == 0){return a;} return gcd(b, a % b);}

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	ll n, m, k; cin >> n >> m >> k;
	vector<ll> a(n); for (int i = 0; i < n; i ++) cin >> a[i];
	ll ans = 0, cnt = 0;
	set<pl> s;
	for (ll i = 0; i < n; i ++){	
		s.insert({i, a[i]});
		cnt += a[i]; 
		ans += a[i];
		if (s.size() > m){
			pl p = *s.begin();
			cnt -= p.se;
		}
		if (s.size() == m){
			while(cnt > k){
				pl p = *s.begin();
				s.erase(p);
				if (cnt - p.se < k){
					s.insert({p.fi, p.se - (cnt - k)});
					ans -= cnt - k;
					cnt = k;
				} else{
					ans -= p.se;
					cnt -= p.se;
				}
			}
		}
	}
	cout << ans << '\n';
}

/*
Do something instead of nothing!
Print out stuffs / study samples when you cannot find the bug!
*/