#include <iostream>
#include <cmath>
using namespace std;
int main() {
int a,b;
float geoMed;
float medArm;
cin>>a>>"\n">>b;
geoMed = sqrt(a*b);
medArm = (2 * (a * b)) / (a + b);
cout<<"media aritmetica\t"<<(a + b) / 2<<endl;
cout<<"\n media geometrica\t"<<geoMed<<endl;
cout<<"\n media armonica\t"<<medArm<<endl;
return 0;
}
