#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 10000000000000000



int main(){
	
	int n;
	cin>>n;
	
	vector<int> p(n);
	vector<long long> point(n);

	rep(i,n){
		scanf("%d",&p[i]);
		point[p[i]-1] = i+1;
	}
	
	vector<long long> dp(2,0);
	
	rep(i,n){
		vector<long long> ndp(2,-Inf);
		ndp[1] = max(dp[0] + point[i], dp[1] + point[i]);
		ndp[0] = max(dp[0], dp[1] - point[i]);
		swap(dp,ndp);
		
	}
	
	cout<<dp[0]<<endl;
	
	return 0;
}