#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,j,s;
	cin>>i>>j;
	if(i<j)swap(i,j);
	s=i*i-i*j;
	cout<<s;
	return 0;
}

/**************************************************************
	Problem: 1324
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/