#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
import numpy as np

# %%
N = int(readline())
m = map(int, read().split())
AB = list(zip(m, m))

# %%
AB_1 = AB[: N // 2]
AB_2 = AB[N // 2:]


# %%
def make_nums(AB):
    dp = np.zeros(1, np.int64)
    for a, b in AB:
        dp = np.concatenate([dp + a, dp - b])
    return dp


# %%
X = make_nums(AB_1)
Y = make_nums(AB_2)
INF = 10 ** 18
Y = np.append(Y, -INF)
Y = np.append(Y, INF)
X.sort()
Y.sort()

# %%
ind = np.searchsorted(Y, -X)
vals_1 = X + Y[ind]
vals_2 = X + Y[ind - 1]
vals = np.concatenate([np.abs(vals_1), np.abs(vals_2)])

# %%
print(vals.min())