#include <iostream>
#include <cmath>

using namespace std;

double staticF(double x){
    return pow(x,2) - x -3;
}

double countS(double p, double dl, int n){
    double w = 0;
    for(int i=0; i<n; i++){
        w = w + abs(staticF(p+i*dl+dl/2));
        cout<<"sF"<<staticF(p+i*dl+dl/2)<<endl;
    }

    double s;

    s = w * dl;

    return s;
}

int main()
{
    double p,q;
    int n;
    cout << "Podaj p" << endl;
    cin>>p;
    cout<<endl<<"Podaj q"<< endl;
    cin>>q;
    cout<<endl<<"Podaj n, odpowiadajce za liczbe prostokatow"<<endl;
    cin>>n;

    double dl = (q-p)/n;
   // cout<<dl<<endl;

    cout<<"W Y N I K" <<endl;
    cout<<countS(p, dl, n);



    return 0;
}