func getPrime(num:Int64) -> [Int64:Int64] {
    var ret = [Int64:Int64]()
    var temp = num
    for i in 2...num {
        if temp == 1 {
            break
        }
        if temp % i == 0 {
            ret[i] = 0
            while temp % i == 0 {
                ret[i] = ret[i]! + 1
                temp = temp / i
            }
        }
    }
    return ret
}

let target = Int64(readLine()!)!

let dic = getPrime(num: target)

var ans:Int64 = 1
for item in dic {
    if(item.value % 2 != 0) {
        ans = ans * item.key
    }
}

print(ans)