#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     long long int n, m = 0, p = 0, cnt = 0, f = 0;     cin >> n;     long long int a[n];     for (long long int i = 0; i < n; i++) {       cin >> a[i];       if (a[i] < 0) {         m++;       }       if (a[i] > 0) p++;       if (a[i] < 0) {         cnt = cnt - a[i] - 1;       }       if (a[i] > 0) {         cnt = cnt + a[i] - 1;       }       if (a[i] == 0) {         cnt = cnt + 1;         f++;       }     }     if (f and m % 2 == 0) cout << cnt << endl;     if (f and m % 2 != 0) cout << cnt << endl;     if (!f and m % 2 == 0) cout << cnt << endl;     if (!f and m % 2 != 0) cout << cnt + 2 << endl;   }   