#include <iostream>
#include <vector>
using namespace std;
void solve(){
int n,ans = 0;
cin >> n;
vector<int> a(n);
for(auto &i : a) cin >> i;
sort(a.begin(),a.end());
int i = 0;
while(a[i] < 0 && i < n){
ans += a[i];
i++;
}
cout << ans;
}
signed main(){
solve();
}