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#!/usr/bin/env python3
import sys
def multiple_by_two(ints: list, start: int) -> int:
"""Multiple the start number by 2 if it is in the list
Args:
ints (list): List of integers
start (int): The starting number
Returns:
int: The first value that isn't in the string
"""
solution = start
while solution in ints:
solution *= 2
return solution
def main():
# Convert input into integers
array = [int(n) for n in sys.argv[1:]]
start = array.pop()
result = multiple_by_two(array, start)
print(result)
if __name__ == '__main__':
main()
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