/* 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 fiboFirst = 1;
            int fiboSecond =2;
            int fib = 0;
            int sum = 0;
 
            while(fiboSecond < 4000000)
              {
                fib = fiboFirst + fiboSecond;
                fiboFirst = fiboSecond;
                fiboSecond = fib;
                if (fib % 2 == 0)
                  {
                    sum = sum + fib;
                  }
              }
            System.out.println(sum+2);
	}
}

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