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"""
Problem Statement:
Work out the first ten digits of the sum of the following one-hundred 50-digit
numbers.
"""
def solution(array):
"""Returns the first ten digits of the sum of the array elements.
>>> import os
>>> sum = 0
>>> array = []
>>> with open(os.path.dirname(__file__) + "/num.txt","r") as f:
... for line in f:
... array.append(int(line))
...
>>> solution(array)
'5537376230'
"""
return str(sum(array))[:10]
if __name__ == "__main__":
n = int(input().strip())
array = []
for i in range(n):
array.append(int(input().strip()))
print(solution(array))