N = int(input())
X = N
d = 2
L = []

while N >= d*d:
    if N % d == 0:
        L.append(d)
        N = N / d
    else:
        d += 1
L.append(int(N))

if N == X:
    print(X)
    exit()

D = {}
for x in L:
    if not x in D:
        D[x] = 1
    else:
        D[x] += 1
Y = 1
for x in D:
    if D[x] %2 != 0:
        Y *= x
print(Y)