import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class No51 {

	public static void main(String[] args) throws IOException{
		//やる気の問題
		String[] text = readStr();
		long W = Integer.parseInt(text[0]) , D = Integer.parseInt(text[1]);
		while(D > 1){
			W = W - Math.floorDiv(W, D * D);
			D--;
		}
		
		System.out.println(W);

	}
	
	public static String[] readStr() throws IOException{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		ArrayList<String> list = new ArrayList<>();

		do {
			list.add(br.readLine());
		}while(br.ready());

		br.close();

		String[] text = new String[list.size()];
		list.toArray(text);

		return text;

	}

}