import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final int W = sc.nextInt();
		final int D = sc.nextInt();
		
		for(long day = D, work = W; day > 0; work -= work / (day * day), day--){
			if(day == 1){
				System.out.println(work);
			}
		}
	}
	
}