#include <bits/stdc++.h> using namespace std; int main() { int n,a[100004],max=0,sum=0; bool t=0; cin >> n; for (int i=1;i<=n;i++) { cin >> a[i]; if (i!=1&&a[i]*a[i-1]>max) { max=a[i]*a[i-1]; //cout << max << " "; } } //cout << endl; //cout << max << endl; if (max!=1) { for (int i=1;i<=n;i++) { if (a[i]*a[i+1]==max&&t==0) { sum+=a[i]*a[i+1]; t=1; i++; }else { sum+=a[i]; } //cout << sum << " "; } }else { for (int i=1;i<=n;i++) { sum+=a[i]; } } cout << sum; }