N = int(input())
d = 2
L = []
while N > d:
    if N % d == 0:
        L.append(d)
        N = N / d
    else:
        d += 1
L.append(int(N))
        
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)