#include <iostream>

#include <math.h>


using namespace std;


int main()
{
  
  float d,f,g,h,m,N,P;
  
  cout<<"Ââåäèòå d: "; cin >> d;
 
   cout<<"Ââåäèòå f: "; cin >> f;
  
  cout<<"Ââåäèòå g: "; cin >> g;
  
  cout<<"Ââåäèòå h: "; cin >> h;
 
  
  m=(d-f)/(g+h);
  
  cout << "m = " << m << endl;
    
 
    if(m<0)
 
   N = abs((int)m);
  
  else if(m>0)
  
  N = sqrt(m);
   
 else 
 
   N = d*d;
 
    cout << "N = " << N << endl;
   
   if ((1<d) and (2>d)) 

   P = N-d;
  
  else 
 
   P = 1/N;
  
  
 cout << "P = " << P << endl;
   
  
 return 0;

}