#include <iostream>
using namespace std;
int main()
{
    float a, b, c, srednia, suma;
    cout << "\n";
    cin >> a >> b >> c;
    suma = a + b + c;
    srednia = suma / 3;
    cout << "Suma wynosi: " << suma << "\n";
    cout << "Srednia wynosi: " << srednia;
    return 0;
}