#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/2); return 0; }