Hacker rank A Very Big Sum

#!/bin/python3
 
import math
import os
import random
import re
import sys
 
#
# Complete the 'aVeryBigSum' function below.
#
# The function is expected to return a LONG_INTEGER.
# The function accepts LONG_INTEGER_ARRAY ar as parameter.
#
 
def aVeryBigSum(ar):
    # Write your code here
    return sum(ar)
if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')
 
    ar_count = int(input().strip())
 
    ar = list(map(int, input().rstrip().split()))
 
    result = aVeryBigSum(ar)
 
    fptr.write(str(result) + '\n')
 
    fptr.close()