def find_radical(number):
    radical = 1
    divisor = 2
    while divisor ** 2 <= number:
        if number % divisor == 0:
            while number % divisor == 0:
                number //= divisor
            radical *= divisor
        divisor += 1
    if number > 1:
        radical *= number
    return radical


number = int(input())
radical = find_radical(number)
for i in range(1, 30):
    x = i * radical
    if pow(x, x, number) == 0:
        print(i * radical)
        break