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#include<iostream>
using namespace std;
int n, t[500007], ciach;
int main(){
  cin >> n;
  for(int i = 1;i <= n;i++){
    cin >> t[i];
    t[i] += t[i - 1];
  }
  if(t[n] < 0){
    cout << -1;
    return 0;
  }
  for(int i = 1, prev = 0;i < n;i++){
    if(t[n] - t[i] >= 0 && t[i] - prev >= 0){
      prev = t[i];
      ciach++;
    }
  }
  cout << n - 1 - ciach;
}