#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
double a,b,c;
cin>>a>>b>>c;
if(a+b>c&&a+c>b&&b+c>a)
printf("Perimetro = %.1lf\n",a+b+c);
else
printf("Area = %.1lf\n",(a+b)*c/2);
return 0;
}