import java.io.*;
public class Main{
static BufferedReader in =new BufferedReader(new InputStreamReader(System.in));
static int n,m;
public static void main(String[] args) throws Exception{
String[] init = in.readLine().split(" ");
n = Integer.parseInt(init[0]);
m = Integer.parseInt(init[1]);
int day = 0;
while(n>0){
day++;
n--;
if(day%m==0) n++;
}
System.out.print(day);
}
}