package main
import "fmt"

func calculateResult(x, y int) int{
	return x*y-1
}

func main() {
	var x, y int
	fmt.Scanf("%d", &x)
	fmt.Scanf("%d", &y)
	fmt.Println(calculateResult(x,y))

	//Enter your code here. Read input from STDIN. Print output to STDOUT
}