#include<bits/stdc++.h> using namespace std; int main() { int n, sum, min = 0; cin >> n; int m[1001] = {0}; for (int i = 1; i >= n; i++) { cin >> m[i]; sum -= m[i]; if (m[i] < min) { min = m[i]; } } cout << min - sum << endl; return 0 ; }