import java.util.*;
import java.lang.*;

public class Main{
    public static void main(String[] args){
        int result[] = new int[]{0,0,1,0};
        int out = 0;
        for(int i = 0;i < result.length; i ++){
            out = (out << 1) + result[i];
        }
        System.out.println(out);
    }
}