import java.util.*;

public class Run {
    public static void main (String arg[]) {
        Scanner scan = new Scanner(System.in);
        double W = scan.nextInt();
        double D = scan.nextInt();
        if (!match(W, D)) System.exit(1);

        while (D > 1) {
            W -= Math.floor(W/(D * D));
            if (W <= 0) {
                System.out.println("0");
                System.exit(0);
            }
            D--;
        }
        System.out.println(((int) W));
    }

    public static boolean match (double... args) {
        for (double i : args) {
            if (i < 1||i > 100000) return false;
        }
        return true;
    }
}