#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cstdlib>
using namespace std;
 
int N, Min, Max;
int MAX = -999999999 + 5;
int Q[500050];
int sum[500050];
 
void init_file()
{
    freopen("max.in", "r", stdin);
    freopen("max.out", "w", stdout);
}
 
void read_data()
{
    scanf("%d%d%d", &N, &Min, &Max);
    for(int i = 1; i <= N; i++)
    {
        int x;
        scanf("%d", &x);
        sum[i] = sum[i - 1] + x;
    }
}
 
void work()
{
    int l = 1;
    int r = 0;
    r ++;
    Q[r] = 0;
    int ans = -0x3f3f3f3f;
    for(int i = Min; i <= N; i++)
    {
        while(l<=r && i - Q[l] > Max) l++;
        while(l<=r && sum[Q[r]]>=sum[i-Min]) r--;
        Q[++r] = i-Min;
        ans = max(ans,sum[i]-sum[Q[l]]);
    }
    printf("%d",ans);
}
 
int main()
{
    read_data();
    work();
    return 0;
}