//standard
#include <stdio.h>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <stdlib.h>
#include <cmath>

#define steps 101

using namespace std;

int n = 100;
double xmin = 0.;
double xmax = 2.;
double xstep = (xmax-xmin)/n;
double x[steps];
double fx[steps], sumx, Int_x;

double simpson(double y[], int length, double step){
  double sum = 0.;
  double Int;
  for(int i=1; i<n; i+=2){
    sum = sum+4.0*y[i];
  }
  for(int i=2; i<n-1; i+=2){
    sum = sum+2.0*y[i];
  }
  Int = step*(y[0]+y[n]+sum)/3.;
  return Int;
}

void a(){
  for(int i=0; i<n+1; i++){
    x[i] = xmin+i*xstep;
  }
}

int integral(){
  a();
  for(int i=0; i<n+1; i++){
    fx[i] = (x[i])*(x[i]);
  }

  Int_x = simpson(fx, steps, xstep);
  cout << Int_x << endl;

  return 0;
}