# Untitled

Oct 27th, 2021
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1. def main():
2.     start = int(input())
3.     olymp_coord = int(input())
4.     portals_qnt = int(input())
5.     lp_from_start: int = -10**8
6.     rp_from_start: int = 10**8
7.     lp_from_olymp: int = -10**8
8.     rp_from_olymp: int = 10**8
9.     for _ in range(portals_qnt):
10.         portal_coord: int = int(input())
11.         if portal_coord < olymp_coord:
12.             if portal_coord > lp_from_olymp:
13.                 lp_from_olymp = portal_coord
14.         elif portal_coord >= olymp_coord:
15.             if portal_coord < rp_from_olymp:
16.                 rp_from_olymp = portal_coord
17.         if portal_coord < start:
18.             if portal_coord > lp_from_start:
19.                 lp_from_start = portal_coord
20.         elif portal_coord >= start:
21.             if portal_coord < rp_from_start:
22.                 rp_from_start = portal_coord
23.     time_to_olymp_from_portal = min([abs(rp_from_olymp - olymp_coord), abs(olymp_coord - lp_from_olymp)])
24.     time_to_start_from_portal = min([abs(rp_from_start - start), abs(start - lp_from_start)])
25.     time_through_portal = time_to_olymp_from_portal + time_to_start_from_portal + 1
26.     time_to_olymp_from_start = abs(start - olymp_coord)
27.     print(min(time_through_portal, time_to_olymp_from_start))
28.
29. main()
30.
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