from collections import *
from itertools import *
from functools import *
from heapq import *
import sys,math
input = sys.stdin.readline


X = int(input())
Y = []
ans = 1
now = 2
while X!=1:
    if now>10**6:
        break
    while X%now==0:
        Y.append(now)
        X //= now
    now += 1
C = Counter(Y)
Y.append(X)
for k,v in C.items():
    
    if v%2==0:
        continue
    ans *= k
print(ans)