package main

import (
	"fmt"
	"math"
)

func main() {
	var x int
	_, _ = fmt.Scan(&x)

	for y := 1; y <= x; y++ {
		z := math.Sqrt(float64(x * y))
		// fmt.Println(x, y, z)
		if math.Ceil(z) == math.Floor(z) {
			fmt.Println(y)
			break
		}
	}
}