import java.util.*;
import java.io.*;

public class Main
{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n=sc.nextInt();
		int[]nums =new int[n];
		for(int i=0;i<n;i++){
		    nums[i]=sc.nextInt();
		}
		
		int y=sc.nextInt();
		int x=sc.nextInt();
		
		
		int[] prefix=new int[n];
		prefix[0]=nums[0];
		
		int[] answer = new int[n];
		for(int i=1;i<n;i++){
		    if(i-y >= 0){
               prefix[i]=nums[i]+prefix[i-y];
		    }
		    else{
		        prefix[i]=nums[i];
		    }
		}
		int res= Integer.MAX_VALUE;
		
		for(int i=x*y-y;i<n;i++){
		    if(i-x*y >= 0){
		     answer[i]=prefix[i]-prefix[i-x*y];   
		     res = Math.min(res,answer[i]);
		    }
		    else{
		        answer[i]=prefix[i];
		        res = Math.min(res,answer[i]);
		    }
		}
		System.out.print(res);
		

	}
}