from collections import defaultdict
x=int(input())
t=x
dic=defaultdict(int)
for i in range(2,int(x**0.5) + 1):
    while t%i == 0:
        dic[i] += 1
        t//=i

if t != 1:
    dic[t] += 1

ans = 1
for i,j in dic.items():
    if j%2!=0:
        ans *= i

print(ans)