dg

package excel;

import java.util.Scanner;

public class doExcel {
    public static void main(String args[]){
        
        
        System.out.println(f(2,4));

        
    }
    
    
    static int f(int a,int n){
        if(n>1){
            return pf(f(a,n/2));
            
        }else{
            return a;
            
        }
    }
    
    static int pf(int a){
    return a*a;
    }
    

}