#include <iostream>
using namespace std;

int main()
{
    int p[6];
    int i, soucet = 0;

    for( i = 0 ; i < 6 ; i ++ )
    {
       cin >> p[i];
    }

    i = 0;
    for(  ; i < 6 ; i ++ )
    {
       soucet = soucet + p[i];
    }

    cout << "Prumer je " << (float)soucet / i << "\n";


}