#include <iostream>
#include <algorithm>
#include <fstream>

using namespace std;

int main()
{
   unsigned long long a, b, c;
   ifstream  fin;
   ofstream fout;
   fin.open("ant.in");
   fout.open("ant.out");

   fin >> a >> b >> c;
   fout << min(c * c + (a + b) * (a + b), min(b * b + (a + c) * (a + c), a * a + (c + b) * (c + b))) << endl;
}