import java.util.*;
import java.lang.Math;
public class Main{
	public static void main(String [] args){
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int m = in.nextInt();
		int countn = 0;
		int countm =0;
		for(int i =2;i<=n*2;i=i+2){
			countn= countn+(n-(i/2));
		}
		for(int i=2;i<=m*2;i=i+2){
			countm=countm+(m-(i/2));
		}
		System.out.print(countn+countm);
		
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz