x = int(input())

d = {}
s = 0
while s == 0:
    for i in range(2, x+1):
        if x % i == 0:
            x = x// i
            if not i in d:
                d[i] = 1
            else:
                d[i] += 1
            if x == 1:
                s = 1
            break

keys = [k for k, v in d.items() if v % 2 != 0]

ans = 1
for i in keys:
    ans *= i

print(ans)