#include
#include
#include
using namespace std;
class Triangle{
int a,b,c;
public:
double Area(){
double s=(a+b+c)/2;
return sqrt(s*(s-a)*(s-b)*(s-c));
};
int Perimeter(){
return a+b+c;
}
void Input(){
cin>>a>>b>>c;
}
};
void main(){
Triangle t1;
t1.Input();
cout