import os

# Variant 1
def solve(dir_input, dir_result, filename_result):
    file_input = open(os.path.join(dir_input, 'data.txt'))

    inputs = [int(line) for line in file_input.readlines()]
    if inputs:
        result = max(inputs) ** 2
        file_result = open(os.path.join(dir_result, filename_result), "w")
        file_result.write(str(result))
        file_result.close()

if __name__ == "__main__":
    solve("/var/result", '/var/result', 'result.txt')