func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     long long n, i, s = 0;     cin >> n;     long long a[n];     for (i = 0; i < n; i++) {       cin >> a[i];     }     s = s + a[0];     for (i = 1; i < n; i++) {       if (a[i] != 1) {         s = s + i * (a[i] - 1) + a[i];       } else {         s = s + 1;       }     }     cout << s << endl;   }   int main() {     long long t = 1;     while (t--) {       solve();     }   }   