import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import numpy as np

A = np.fromstring(read(), np.int64, sep=' ')[1:]

Acum = np.cumsum(A)

S = Acum[-1]
x = np.arange(1, int(S**.5)+1, dtype=np.int64)
div = x[S%x == 0]
div = np.union1d(div, S // div)

exists = np.zeros(S+1, np.bool_)
exists[Acum] = 1

for d in div:
    if np.all(exists[np.arange(d,S,d)]):
        answer = S // d
        break

print(answer)