'Update global variable with Pool() executions

Pretty new to multiprocessing and global variables, need to update value x with every pool execution. Final result will be 65 (5+10+20+30). Any thoughts?

from multiprocessing import Pool

x = 5

def modify(part):
  global x
  x += part

if __name__ == '__main__':

    parts = [10, 20, 30]

    with Pool(3) as p:
        p.map(modify, parts)

    print(x)

python-3.x

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'Update global variable with Pool() executions

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