import java.util.Scanner;

public class hospital {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int period = Integer.parseInt(scanner.next());
        int patients = Integer.parseInt(scanner.next());

        int treated = 0;
        int untreated = 0;
        int count = 0;

        for (int i = 0; i <= period ; i++) {
            count++;
            if(count < 3){
                if(7 >= patients){
                    treated += patients;

                }else {
                    treated += 7;
                    untreated += patients - 7;

            }
            if(count >= 3){
                if(patients < 8){
                    treated += patients;

                }else {
                    treated += 8;
                    untreated += patients - 8;

            }



        }




    }
}}}