import java.util.Collections;
import java.util.LinkedList;

public class Comb{

        public static void main(String[] args){
                System.out.println(comb(3,5));
        }

        public static String bitprint(int u){
                String s= "";
                for(int n= 0;u > 0;++n, u>>= 1)
                        if((u & 1) > 0) s+= n + " ";
                return s;
        }

        public static int bitcount(int u){
                int n;
                for(n= 0;u > 0;++n, u&= (u - 1));