#include<cstdio>
#include<iostream>
using namespace std;
int main()
{
double a,b,c;
scanf("%lf%lf%lf",&a,&b,&c);
if(a+b>c&&a-b<c&&b-c<a&&c-a<b) printf("Perimetro = %.1lf",a+b+c);
else printf("Area = %.1lf",(a+b)*c*0.5);
return 0;
}