You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
"""
Write code in python to calculate the sum of every nth element of an array.
"""

# Function to calculate the sum of every nth element of an array.
def sum_nth(array, n):
    # Initialize the result
    result = 0
    
    # Iterate to increment the result
    i = 0
    while i < len(array):
        result += array[i]
        i += n
        
    return result

if __name__ == '__main__':
    array = [4, 5, 2, 9, 8, 6, 2, 3, 7, 1]
    n = 3
    print(sum_nth(array, n)) # 18
user
16
assistant