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)

se = set(Acum)
for d in div:
    if set(np.arange(d,S,d)) <= se:
        answer = S//d
        break

print(answer)