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#!/usr/bin/env python3
from typing import List
def is_valid(nums: List[int], lp: int, up: int) -> bool:
for i in range(lp, up):
x = nums[up] - nums[i]
if x in nums[lp:up] and x != nums[i]:
return True
return False
def main() -> None:
with open("input", "r") as f:
nums = list(map(int, f.readlines()))
lp = 0
up = 25
while is_valid(nums, lp, up):
lp += 1
up += 1
print(nums[up])
if __name__ == "__main__":
main()
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