x = int(input())

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

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