请问这个JAVA程序如何优化占用内存？

import java.util.Scanner; public class Main { public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);  int n = sc.nextInt(); int m = sc.nextInt();  if(0<n&&m<=200){ int i;  i=(m-1)*(n-1);  System.out.println(i);  }
        }
}