#include <stdio.h>

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

int main() 
{
	float x,y,m;
	printf("x = ");
	scanf("%f",&x);
	printf("y = ");
	scanf("%f",&y);
	m = mittelwert(x,y);
	printf("Mittelwert = %f \n", m);
	return 0;
}