#include<stdio.h>
#include<bits/stdc++.h>
int main()
{
	double a,b,c;
	scanf("%f %f %f",&a,&b,&c);
	double p=(a+b+c)/2.0;
	double s=sqrt(p*(p-a)*(p-b)*(p-c));
	printf("%f %f %f\n",a,b,c);
	printf("%f\n",p);
	printf("%.1lf",s);
	return 0;
}