#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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