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import sys

OJ_DANA_DANA = sys.stdin.read().split()

N = int(OJ_DANA_DANA[0])
BURSZTYNY = list(map(int, OJ_DANA_DANA[1:]))

SUMA = sum(BURSZTYNY)

DZIELNIKI = []
for i in range(2, int (SUMA ** 0.5) + 1):
    if SUMA % i == 0:
        if (i <= N):
            DZIELNIKI.append(i)
        if (SUMA // i <= N):
            DZIELNIKI.append(SUMA // i)
DZIELNIKI.sort()
DZIELNIKI.reverse()


FOUND = False
for d in DZIELNIKI:
    A = BURSZTYNY[:]
    ILE = SUMA

    ROZKLAD = [0] * d

    for i,v in enumerate(A):
        ROZKLAD[i%d] += v
    if not all(x == ROZKLAD[0] for x in ROZKLAD):
        continue

    for i, v in enumerate(A[:-d+1]):
        if A[i] < 0:
            break
        if A[i] > 0:
            C = A[i]
            for j in range(i, i+d):
                A[j] -= C
                ILE -= C
    if ILE < 0 or ILE > 0:
        continue
    non_zeros = [1 if A[i] != 0 else 0 for i in range(d+1, N) ]
    if sum(non_zeros) == 0:
        FOUND = True
        print(d)
        break

if not FOUND:
    print(1)