#include<iostream>
using namespace std;
int main(){
	int n,a,b,c;
	cin>>n>>a;
	if(n>a){
		b=n-a;
		c=n*b;	
	}else if(a>n){
		b=a-n;
		c=a*b;
	}
	cout<<c;	
}
/**************************************************************
	Problem: 1324
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/