/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.print(power(2,2));
	}
 
    public static int power(int a, int b){
	    if (b < 0){
		    return 0; //error
	    } else if (b == 0){
		    return 1;
	    } else {
		    return a* power(a, b-1);
	}
}
 
}

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