#include <iostream>
#include <cmath>


int main()
{
    double a,b,c;
   std:: cout << "Unesite tri broja:\n "<< std::endl;
   std:: cin >>a;
   std:: cin >>b;
   std:: cin >>c;
   if ((a>0 && b>0 &&c>0) && (((a+b)>c)|| ((a+c)>b) || ((b+c))>a))
   {
       double s, P;
       const double PI=4*atan(1);
       s=(a+b+c)/2;
       P=std::sqrt(s*(s-a)*(s-b)*(s-c));
      std::cout <<"Povrsina trougla sa duzinama stranica"<< a << b << "i" <<c<<" iznosi "<< P << std::endl;
       double ugao1, ugao2, ugao3;
       ugao1=acos((a*a+b*b-c*c)/(2*a*b));
       ugao2=acos((a*a+c*c-b*b)/(2*a*c));
       ugao3=acos((b*b+c*c-a*a)/(2*b*c));
       double maxu=ugao1;
       if (ugao2>ugao1) ugao2=maxu;
     else if (ugao3>ugao1) ugao3=maxu;
       double stepeni, minute, sekunde;
       stepeni=maxu*180/PI;
       minute=(stepeni-(int)stepeni)*60;
       sekunde=(minute-int(minute))*60;
      std::cout<<"Njegov najveci ugao ima"<<int(stepeni)
       <<"stepeni"<<int(minute)<<" minuta" << " i " <<int (sekunde) <<"sekundi"<< std::endl;
   }
   else {
   std::cout<<"Ne postoji trougao cije su duzine stranice: " <<a<<", "<<b<< " i "<<c<< std::endl; }
    return 0;
}