/* package whatever; // don't place package name! */
 
import java.util.*;
import java.math.*;
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
	{
		// your code goes here
		BigInteger bi = BigInteger.ONE.add(BigInteger.ONE);
 
		for (int i = 0; i < 30; i++) {
			bi = bi.pow(2);
			//bi = bi.multiply(bi);
		}
 
		System.out.println(bi.bitLength());
	}
}

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