/* 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
	{
		// your code goes here
		int[] array = {1, 2, 2, 3, 3, 3, 4, 5}; // Create an integer array of size 5
        int n = array.length;
        int target = 3;
        int l = 0, r = n - 1;
        int ans = -1;
        while(l<=r){
            int mid = l+(r-l)/2;
            if(array[mid] < target){
                l = mid + 1;
            }else if(array[mid] > target) {
                r = mid -1;
            }else{
            	ans = mid;
            	r = mid-1;
            }
        }
 
        System.out.print(ans);
	}
}

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