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