#include<iostream>
#include<cstdio>
using namespace std;
int main(){
double A,B,C;
cin >> A >> B >> C;
if(A+B>C && B+C>A && A+C>B){ //任意两边之和大于第三边,就是指每两条边的和都要大于第三边
printf("Perimetro = %.1f",A+B+C);
}else{
printf("Area = %.1f",(A+B)*C*0.5);
}
return 0;
}