def calc_average(nums):
    # Type your code here.
    if not nums:  
        return 0.0
    
    total = 0
    for num in nums:
        total += num
    
    return total / len(nums)
    
if __name__ == '__main__':
    nums = [1, 2, 3, 4, 5]
    print(calc_average(nums))
    
# input: 1 2 3 4 5 6