import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int W = sc.nextInt();
        int D = sc.nextInt();
        
        while(D!=1){
            int w1d = W/D/D;
            W = W - w1d;
            D--;
        }
        System.out.println(W);
    }
}