if __name__ == '__main__':
    N, numbers = get_input()
    s = [0]
    for i in range(N):
        s.append(s[-1] + numbers[i])
    s.sort()
    print(s)
    count = 1
    result = 0
    for i in range(N):
        if(s[i] == s[i+1]):
            count += 1
        else:
            result += count * (count -1 ) // 2
            count = 1
    result += count * (count -1 ) // 2
    print(result)