#include <iostream>

using namespace std;

int main()
{
    float a,b,c,arsredina;

    cout<<"Vnesi broj a"<<endl;
    cin>>a;
    cout<<"Vnesi broj b"<<endl;
    cin>>b;
    cout<<"Vnesi broj c"<<endl;
    cin>>c;

    arsredina = (a+b+c)/3;
    cout<<"Aritmetickata sredina e "<<arsredina<<endl;
}