import sys, time, random
from collections import deque, Counter, defaultdict
import logging
from logging import debug, error, info, warning
logging.basicConfig(level=logging.DEBUG)
input = lambda: sys.stdin.readline().rstrip()
ii = lambda: int(input())
mi = lambda: map(int, input().split())
li = lambda: list(mi())
inf = 2 ** 31 - 1
mod = 998244353

n = ii()
a = li()
random.shuffle(a)
ans = -1
dp0 = [[-inf] * 10001 for _ in range(n + 1)]
dp1 = [[-inf] * 10001 for _ in range(n + 1)]
dp0[0][0] = 0
for i in range(n):
    for j in range(10001):
        dp0[i + 1][j] = max(dp0[i + 1][j], dp0[i][j] + a[i])
        dp1[i + 1][j] = max(dp1[i + 1][j], dp1[i][j] + a[i])
        dp1[i + 1][abs(j - a[i])] = max(dp1[i + 1][abs(j - a[i])], dp1[i][j])
        dp1[i + 1][abs(j - a[i])] = max(dp1[i + 1][abs(j - a[i])], dp0[i][j])
        if j + a[i] <= 10000:
            dp1[i + 1][j + a[i]] = max(dp1[i + 1][j + a[i]], dp1[i][j])
            dp1[i + 1][j + a[i]] = max(dp1[i + 1][j + a[i]], dp0[i][j])

ans = max(ans, -1 if dp1[n][0] <= 0 else dp1[n][0])
print(ans)