#include <iostream>
#include <cstdio>

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 = %.1f", a + b + c);
    else 
        printf("Area = %.1f", (a + b) * c / 2.0); 

    return 0;
}