X = 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
    
facts = factorization(X)

ans = 1
for f, num in facts:
    if num & 1:
        ans *= f
        
print(ans)