def make_divisors(n):
    lower_divisors , upper_divisors = [], []
    i = 1
    while i*i <= n:
        if n % i == 0:
            lower_divisors.append(i)
            if i != n // i:
                upper_divisors.append(n//i)
        i += 1
    return lower_divisors + upper_divisors[::-1]

N = int(input())

for i in range(max(0,N-100),N+101):
  l =  make_divisors(i)
  if len(l) >= 3:
    print(i)
    exit()