import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scan= new Scanner(System.in);
        int n=scan.nextInt();
        int[] a= new int[n];
        for(int i=0;i<n;i++){
            a[i]=scan.nextInt();
        }
        int count=0;
        for(int k=0;k<n;k++){
            for(int i=0,j=i+k;i<n && j<n;i++,j=i+k){
                int sum=0;
                for(int x=i;x<=j;x++){
                    sum+=a[x];
                }
                count=sum<0? count+1:count;
        }}
        System.out.println(count);
    }
}