Sicily 2013. Pay Back

#include <iostream>

using namespace std;

int arr[100001];

int main()
{
int n;
cin >> n;
int step=0,money=0,debt_pos;
for(int i=1; i <= n; i++){
++step;
cin >> arr[i];
if(money >= 0 && money+arr[i] < 0) debt_pos=i;
if(money < 0 && money+arr[i] >= 0) step+=2*(i-debt_pos);
money+=arr[i];
}
cout << step << endl;
}