#include <stdio.h>

double average(int x,int y,int z)
{
	double a,b;
	b=x+y+z;
	a=b/3;
	return a;
}
	
int main(void)
{
	double x;
	x = average(10,3,4);
	printf("%lf\n",x);
	return 0;
}