#include <iostream>
#include <math.h>
using namespace std;

const int n=4; // no. of particles
double x[n] = {0., 1., 3., 5}; // coordinates of particles
double y[n] = {0., 5., 3., 2};
double z[n] = {6., 2., 3., 6};

int main(){
  double xsum=0, ysum=0, zsum=0; // sum of coordinates
  for (int i=0; i<n; ++i){
    xsum += x[i];
    ysum += y[i];
    zsum += z[i];
  }
  double xc = xsum/n;  // position of center of mass
  double yc = ysum/n;
  double zc = zsum/n;
  cout << xc << ' ' << yc << ' ' << zc << endl;
}