package Yukicoder

/**
 * Created by hichikawa on 2015/11/12.
 */
fun main(args: Array<String>) {
    fun readLineLongArray(): List<Long> {
        val str = readLine() as String
        val arrStr = str.split(" ")
        val ret = arrStr.map { it.toLong() }
        return ret
    }

    fun readLineLong(): Long {
        val str = readLine() as String
        return str.toLong()
    }

    fun readLineInt(): Int {
        val str = readLine() as String
        return str.toInt()
    }

    fun readLineIntArray() : List<Int> {
        val str = readLine() as String
        val arrStr = str.split(" ")
        val ret = arrStr.map { it.toInt() }
        return ret
    }

    fun readLineDoubleArray(): List<Double> {
        val str = readLine() as String
        val arrStr = str.split(" ")
        val ret = arrStr.map { it.toDouble() }
        return ret
    }
    var num = readLineLong()
    var ans = 1.toLong()
    while (num != 1.toLong()) {
        for (i in 2..2) {
            var count = 0
            while (true) {
                if (num % i == 0.toLong()) {
                    num /= i
                    count++
                } else {
                    break
                }
            }
            if (count % 2 == 1) {
                ans *= i
            }
        }
        for (i in 3.toLong()..Math.sqrt(num.toDouble()).toLong() step 2) {
            var count = 0
            while (true) {
                if (num % i == 0.toLong()) {
                    num /= i
                    count++
                } else {
                    break
                }
            }
            if (count % 2 == 1) {
                ans *= i
            }
        }
        println(ans)
    }
}