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


public class Solution {

    public static int countNegativeSubArrays(int[] arr,int n){
        int result = 0;
        for(int i=0;i<n;i++){
            for(int j=i;j<n;j++){
                int temp = 0;
                for(int k=i;k<=j && k<n;k++){
                    temp += arr[k];
                }
                if((j==i && arr[i]<0) || temp<0) result++;
            }
        }
        return result;
    }

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int[] arr = new int[n];
        for(int i = 0; i < n;i++){
            arr[i] = scan.nextInt();
        }
        System.out.print(countNegativeSubArrays(arr,n));
        scan.close();
    }
}