import java.io.*;
import java.math.*;
class Integral{
  public static void main(String args[]){
    int n=90000;
    double a=2;
    double b=5;
    double h=(b-a)/n;

    double sumatoria=0;
    double x=a;
    for (int i=0; i<=n; i++){
      x=a+h*i;
      System.out.println(x);
      if (i==0 || i==n)
        sumatoria+=F(x);
      else if (i%3==0)
        sumatoria+=2*F(x);
      else 
        sumatoria+=3*F(x);
    }
    double valorIntegral = 3.0/8.0*h*sumatoria;
    System.out.println(valorIntegral);
  }

  public static double F(double x){
    return 3*x*x+2;
  }
}