#include <iostream>

using namespace std;

float mittelwert(float a, float b) 
{
	return (a+b)/2;
}

int main() 
{
	float x,y,m;
	cout << "x = ";
	cin >> x;
	cout << "y = ";
	cin >> y;
	m = mittelwert(x,y);
	cout << "Mittelwert = " <<  m << endl;
	return 0;
}