import java.util.;
import java.lang.;
import java.io.*;
public class CC{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
//int t = sc.nextInt();
int t = 1;
while(t-->0){
int n = 5,p = 4,z = 1;
int arr[] ={1,5,4,3,2};
int ans = arr[0];
System.out.println(solve(arr,n,p,z,1,ans));
}
}
public static int solve(int[] arr, int n , int p,int z,int i,int ans){
if(i==n || p == 0) return ans;
if(z>0)
int a = solve(arr,n,p--,z--,i-1,ans+=arr[i-1]); // error here is variable declaration is not allowed here ;
int b = solve(arr,n,p--,z,i+1,ans+=arr[i+1]);
int m = Math.max(a,b);
return m;
}
}