#include <bits/stdc++.h>
using namespace std;
using lol = long long;
int main(){
lol N; cin >> N;
lol frend[N];
for(int i = 0; i < N; i++){
cin >> frend[i];
}
vector<int> furina;
for(int i = 0; i < N - 1; i++){
furina.push_back(frend[i] + frend[i + 1]);
}
lol result = 0;
for(int i = 0; i < furina.size(); i++){
result += furina[i];
}
cout << result;
}
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