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package ali2019;

import java.util.Scanner;

/**

* 阿里客户端模拟笔试

*

* 内存回收：相邻页面不能同时回收，求最大回收的内存

* 输入：

* 3

* 1 2 3

*

* 输出：4

* 回收1和3

*

* @author 刘壮飞

* https://github.com/zfman.

* https://blog.csdn.net/lzhuangfei.

*/

public class Main {

public static int done(int[] m){

int[] dp=new int[m.length];

if(m.length==0) return 0;

if(m.length==1) return m[0];

if(m.length==2) return Math.max(m[0],m[1]);

dp[0]=m[0];

dp[1]=Math.max(m[0],m[1]);

for(int i=2;i<dp.length;i++){

if(m[i]+dp[i-2]>dp[i-1]) dp[i]=m[i]+dp[i-2];

else{

dp[i]=dp[i-1];

}

}

return dp[m.length-1];

}

public static void main(String[] args){

Scanner scanner=new Scanner(System.in);

int n=scanner.nextInt();

int[] m=new int[n];

for(int i=0;i<n;i++){

m[i]=scanner.nextInt();

}

int r=done(m);

System.out.println(r);

}

}