package main

import (
	"fmt"
)

func resolve(W, D int) int {
	ret := W
	for i := D; i > 1; i-- {
		ret -= int(ret / i / i)
	}
	return ret
}

func main() {
	var W, D int
	fmt.Scanf("%d\n%d\n", &W, &D)
	fmt.Println(resolve(W, D))
}