#include <iostream>
#include <boost/lambda/lambda.hpp>
#include <boost/timer.hpp>


int fun(int n){
    if (n<=1) {
        return n;
    }
    return fun(n-1)+fun(n-2);
}

int main(int argc, const char * argv[]) {
    // insert code here...
    std::cout << "Hello, World!\n";
    
    fun(40);
    
    boost::timer tm;
        std::cout << tm.elapsed() << std::endl;
    
    
    
    return 0;
}