#include <iostream>
using namespace std;
int main ()
{
    double a,b,c,m,d;
    cin>>a>>b>>c;
    m=a+b+c;
    d=(a+b)*c/2;
    if(a+b>c&&a+c>b&&b+c>a) 
    {
        printf("Perimetro = %.1lf",m);

    }else printf("Area = %.1lf",(a+b)*c/2);
    return 0;
}