import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int m = in.nextInt();
    
    int nm = n * m;
        
    int count = 1;
        if ( nm % 2 == 0) {
         count = 0;   
        }
    if (nm == 1) {
        System.out.println(nm); 
        return;
    }
    if (m == 1) {
        System.out.println(n-1);
        return;
    }
    if (n == 1) {
        System.out.println(m-1);
        return;
    }
    while (nm > 0) {
        
        nm = nm/m;
        count += nm;
        
    }
    System.out.println(count);
}
}