#include <bits/stdc++.h>
//#define LOL
#if !defined(LOL)
#include "holiday.h"
#endif
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
const int maxn = (int)2e5+10;
long long int findMaxAttraction(int n, int s, int d, int a[]) {
int ans = 0, sum = 0;
multiset<int> S; S.clear();
for(int i = 0; i < n; i++){
S.insert(a[i]); sum+=a[i];
while(sz(S)>max(0,d-i-1)) sum-=*S.begin(), S.erase(S.begin());
ans = max(ans, sum);
}
return ans;
}
#if defined(LOL)
int main() {
int n, start, d;
int attraction[100000];
int i, n_s;
n_s = scanf("%d %d %d", &n, &start, &d);
for (i = 0 ; i < n; ++i) {
n_s = scanf("%d", &attraction[i]);
}
printf("%lld\n", findMaxAttraction(n, start, d, attraction));
return 0;
}
#endif
