#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n;     cin >> n;     int ar[n];     int cnt = 0, cnt2 = 0;     for (int i = 0; i < n; i++) {       cin >> ar[i];       if (ar[i] > 0)         cnt += ar[i];       else         cnt2 += ar[i];     }     cout << cnt - cnt2;     return 0;   }   