def calculate_distance(point, ice_cream):
    return point, min(point % ice_cream, ice_cream - (point % ice_cream))


school, club, ice_cream = map(int, input().split())
if school % 2 == club % 2:
    print(calculate_distance((school + club) // 2, ice_cream))
else:
    print(min(
        calculate_distance((school + club) // 2, ice_cream),
        calculate_distance((school + club) // 2 + 1, ice_cream),
        key=lambda x: x[1],
    ))