func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 1e5 + 85 - 69;   long long int a[maxn], su[maxn], dp[maxn];   int n;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cin >> n;     for (int i = 1; i < n; i++) cin >> a[i];     for (int i = n - 1; i > 0; i--) {       su[i] = su[i + 1] + a[i] - (a[i] & 1);       if (a[i] == 1) su[i] = 0;     }     dp[0] = 0;     long long int sum = 0, ans = 0;     for (int i = 1; i < n; i++) {       sum += a[i] - (a[i] & 1);       if (a[i] == 1) sum = 0;       dp[i] = max(dp[i - 1] + a[i] - (a[i] % 2 == 0), sum);       ans = max(ans, dp[i] + su[i + 1]);     }     cout << ans << endl;     return 0;   }   