#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <bits/stdc++.h>
#include <stack>
#include <map>
using namespace std;
#define For(i,j,n) for(int i=j;i<=n;i++)
#define mst(ss,b) memset(ss,b,sizeof(ss));
typedef long long LL;
template<class T> void read(T&num) {
char CH; bool F=false;
for(CH=getchar();CH<‘0‘||CH>‘9‘;F= CH==‘-‘,CH=getchar());
for(num=0;CH>=‘0‘&&CH<=‘9‘;num=num*10+CH-‘0‘,CH=getchar());
F && (num=-num);
}
int stk[70], tp;
template<class T> inline void print(T p) {
if(!p) { puts("0"); return; }
while(p) stk[++ tp] = p%10, p/=10;
while(tp) putchar(stk[tp--] + ‘0‘);
putchar(‘\n‘);
}
const LL mod=1e9+7;
const double PI=acos(-1.0);
const LL inf=1e18+10;
const int N=1e6+10;
const int maxn=1e3+20;
const double eps=1e-12;
set<int>s;
set<int>::iterator it;
int main()
{
int n;read(n);
s.clear();
int x,fx,fy;
int ans=0,temp;
read(x);ans=ans+x;
s.insert(x);
For(i,2,n)
{
read(x);
if(s.count(x))continue;
it=s.upper_bound(x);
if(it==s.end())temp=abs(x-*(--it));
else
{
temp=abs(x-*it);
if(it!=s.begin())temp=min(temp,abs(x-*(--it)));
}
ans+=temp;
s.insert(x);
}
print(ans);
return 0;
}