#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;
}
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