import java.util.Arrays;
import java.util.Scanner;

public class ProblemSolvingMain {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int a = s.nextInt();
		int b = s.nextInt();
		int c = s.nextInt();
		
		int aa = a, bb = b, cc = c;
		int sum = 0;
		int sum2 = 0;
		
		while(a>0 && b>1) {
			sum++;
			a--;
			sum += 2;
			b-=2;
		}
		
		while(b>0 && c>1) {
			sum++;
			b--;
			sum+=2;
			c-=2;
		}
		
		while(bb>0 && cc>1) {
			sum2++;
			bb--;
			sum2 += 2;
			cc-=2;
		}
		
		while(aa>0 && bb>1) {
			sum2++;
			aa--;
			sum2+=2;
			bb-=2;
		}
		
		System.out.println(Math.max(sum, sum2));
	}
	
}

