from math import *
mx = 10**6+1
nyrn = [1 for i in range(mx)]
for i in range(2,mx):
    if (nyrn[i]):
        for j in range(2,int(sqrt(i))):
            if (j*i >= mx-1):
                break
            nyrn[j*i] = 0
    

sosu = []
for i in range(2,mx):
    if nyrn[i]:
        sosu.append(i)

X = input()
for s in sosu:
    if (X%(s*s))==0:
        X/=(s*s)
print X