x = int(input())

if x == 1:
    print(1)

else:
    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)