import sys

# sys.setrecursionlimit(200005)
int1 = lambda x: int(x)-1
pDB = lambda *x: print(*x, end="\n", file=sys.stderr)
p2D = lambda x: print(*x, sep="\n", end="\n\n", file=sys.stderr)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]
def LI1(): return list(map(int1, sys.stdin.readline().split()))
def LLI1(rows_number): return [LI1() for _ in range(rows_number)]
def SI(): return sys.stdin.readline().rstrip()
dij = [(0, 1), (-1, 0), (0, -1), (1, 0)]
# dij = [(0, 1), (-1, 0), (0, -1), (1, 0), (1, 1), (1, -1), (-1, 1), (-1, -1)]
inf = (1 << 63)-1
# inf = (1 << 31)-1
# md = 10**9+7
md = 998244353

class WaveletMatrix:
    def __init__(self, aa):
        self.dec = sorted(set(aa))
        self.enc = {a: i for i, a in enumerate(self.dec)}
        aa = [self.enc[a] for a in aa]
        self.log = len(self.dec).bit_length()
        self.n = len(aa)
        self.bb = [[0] for _ in range(self.log)]
        for i in range(self.log)[::-1]:
            naa = [[], []]
            for a in aa:
                d = a >> i & 1
                naa[d].append(a)
                self.bb[i].append(self.bb[i][-1]+d)
            aa = naa[0]+naa[1]
        self.fi = {}
        for i in range(self.n)[::-1]: self.fi[aa[i]] = i
        self.aa = aa

    def _move(self, i, idx, d):
        if d: return self.n-self.bb[i][-1]+self.bb[i][idx]
        return idx-self.bb[i][idx]

    def __getitem__(self, idx):
        res = 0
        for i in range(self.log)[::-1]:
            d = self.bb[i][idx+1]-self.bb[i][idx]
            res |= d << i
            idx = self._move(i, idx, d)
        return self.dec[res]

    # count a in [0,r)
    def rank(self, a, r):
        a = self.enc[a]
        if a not in self.fi: return 0
        for i in range(self.log)[::-1]: r = self._move(i, r, a >> i & 1)
        return r-self.fi[a]

    # index of ith(0-indexed) a
    def select(self, a, ith):
        a = self.enc[a]
        if a not in self.fi: return -1
        idx = self.fi[a]+ith
        for i in range(self.log-1):
            d = a >> i & 1
            l, r = -1, self.n-1
            while l+1 < r:
                m = (l+r)//2
                nxt = self.n-self.bb[i][-1]+self.bb[i][m+1] if d else m+1-self.bb[i][m+1]
                if nxt < idx+1: l = m
                else: r = m
            idx = r
        return idx

    # ith value in sorted [l,r)
    def quantile(self, l, r, ith):
        for i in range(self.log)[::-1]:
            c0 = r-l-(self.bb[i][r]-self.bb[i][l])
            if c0 > ith:
                l, r = self._move(i, l, 0), self._move(i, r, 0)
            else:
                l, r = self._move(i, l, 1), self._move(i, r, 1)
                ith -= c0
        return self.dec[self.aa[l+ith]]

n = II()
aa = LI()

wm = WaveletMatrix(aa)

ans = -inf
for k in range(1, n+1):
    m = (k-1)//2
    st = [0]
    t = 0
    for r in range(n, k-1, -k):
        t += wm.quantile(r-k, r, m)*k
        st.append(max(t, st[-1]))
    ans = max(ans, st[-1])
    s = 0
    for l in range(0, n-k+1, k):
        s += wm.quantile(l, l+k, m)*k
        st.pop()
        ans = max(ans, s+st[-1])
        # pDB(k, ans, st)

print(ans)