#include<bits/stdc++.h>
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\n",a+b+c);
    else printf("Area = %.1lf\n",(a+b)*c*1/2);
    return 0;
}