#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>

using namespace std ;

double a , b , c ;

int main ()
{
    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) * 0.5 * c) ;
    }

    return 0 ;
}