X = int(input())
ans = 1

C = 10 ** 6
dat = [0] * C
for i in range(2,C):
    if dat[i] == 0:
        for j in range(i*2,C,i):
            dat[j] = 1
        count = 0
        while X % i == 0:
            count += 1
            X //= i
        if count & 1:
            ans *= i
if X != 1:
    ans *= X
print(ans)