#include <iostream>
    #include <cmath>
     
    int main() 
    {
    	int n = 155;
    	double a = 3.0, b = 17.0;
    	double dx = (b - a) / n;
    	double integral = 0.0;
    	for (double x = a + dx / 2; x < b; x += dx)
    	{
    		integral += exp(x) / x * dx;
    	}
    	std::cout << integral << std::endl;
    	return 0;
  }