private Scanner scanner = new Scanner(System.in);

private int m, n, sum;

private void solve() {

while (scanner.hasNext()) {

m=scanner.nextInt();

n=scanner.nextInt();

int c= n-1;

int r= n*(m-1);

System.out.println(c+r);

}

scanner.close();

}

public static void main(String[] args) {

try {

new Main().solve();

} catch (Exception ex) {

ex.printStackTrace();

}

}