X = int(input())

def prime_factorize_num(x):
    d = dict()
    if x % 2 == 0:
        d[2] = 0
    while x % 2 == 0:
        d[2] += 1
        x //= 2
    f = 3
    while f * f <= x:
        if x % f == 0:
            if f not in d:
                d[f] = 0
            d[f] += 1
            x //= f
        else:
            f += 2
    if x != 1:
        if x not in d:
            d[x] = 0
        d[x] += 1
        
    return d

p = prime_factorize_num(X)

ans = 1
for k, v in p.items():
    if v % 2 == 1:
        ans *= k
print(ans)