#include <cstdio>
int main()
{
double a, b, c;
scanf("%lf%lf%lf", &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;
}