#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 = %.1lf",a + b + c);
    }else{
        printf("Area = %.1lf", (a + b) * c * 0.5);
    }


    return 0;   
}