#include<iostream>
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",a+b+c);
        else printf("Area = %.1lf",(a+b)*c/2.0);
    return 0;
}