#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fori for(int i=0;i<n-1;i++)
#define fin for(int i=0;i<n;i++)cin >> arr[i];
#define forj for(int j=0;j<n;j++)
#define veci vector<int>
int32_t main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n,sum=0;
cin >> n;
veci arr(n);
fin
fori sum += arr[i]+arr[i+1];
cout << sum;
}
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