#include<bits/stdc++.h>
using namespace std;
int Max(int n,int m,int l)
{
	return max(max(m,n),max(n,l));
}
int main()
{
	int a,b,c,m;
	cin>>a>>b>>c;
	m=(Max(a+b,b,c))*(Max(a,b,b+c))/(Max(a,b,c));
    cout<<m;
	return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int a,b,c; cin>>a>>b>>c; cout<<max(max(c,b),a+b)*max(max(a,b),b+c)/max(a,max(b,c)); return 0; } //写迭代回来水点函数题

#include<bits/stdc++.h>
using namespace std;
int meimu(int a,int b,int c)
{
	int d;
	d=a+b;
	return max(max(d,b),c);	
}
int fw(int a,int b,int c)
{
	int e;
	e=b+c;
	return max(a,max(b,e));
}
int lz(int a,int b,int c)
{
	return max(max(a,b),c);
}
int main()
{
	int a,b,c,d;
	cin>>a>>b>>c;
	d=meimu(a,b,c)*fw(a,b,c)/lz(a,b,c);
	cout<<d;
}