/* 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
	{
		int a = 0b11111;

        System.out.println(Integer.toBinaryString(flipBit(a, 2)));
	}
	
	 public static int flipBit(int value, int bitIndex) {
        int mask = 0b1 << bitIndex - 1;
        int result = value ^ mask;

        return result;
    }
}