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


using namespace std;
int main(){
    ifstream in("ant.in");
    cin.rdbuf(in.rdbuf());
    ofstream out("ant.out");
    cout.rdbuf(out.rdbuf());

    int a, b, c;
    cin >> a >> b >> c;

    cout << (a+b)*(a+b)+c*c << endl;

    return 0;
}