n = int(input())
def factorization(n):
    arr = []
    temp = n
    for i in range(2, int(-(-n**0.5//1))+1):
        if temp%i==0:
            cnt=0
            while temp%i==0:
                cnt+=1
                temp //= i
            arr.append([i, cnt])

    if temp!=1:
        arr.append([temp, 1])

    if arr==[]:
        arr.append([n, 1])

    return arr

fact = factorization(n)
ans = 1
for i in range(len(fact)):
    if fact[i][1] % 2 == 1:
        ans *= fact[i][0]
print(ans)