x = int(input())

d = {}
for i in range(2, int(x**0.5)+1):
    while x % i == 0:
        x //= i
        if not i in d:
            d[i] = 1
        else:
            d[i] += 1

y = 1
for k, v in d.items():
    if int(v) % 2 != 0:
        y *= int(k)
print(y)