#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", A+B+C);
    else printf("Area = %.1lf", (A+B)*C/2);

    return 0;
}