def make_divisors(n):
    divisors = []
    for i in range(1, int(n**0.5)+1):
        if n % i == 0:
            divisors.append(i)
            if i != n // i:
                divisors.append(n//i)

    divisors.sort()
    return divisors

l = make_divisors(int(input()))

if l[1] == 2:
    print(l[2])
else:
    print(l[1])