#include<iostream>
#include<iomanip>
#include<fstream>
using namespace std;
int main() {
	const double H = 6.626070040e-34; //Planck's constant (Joule-seconds)
	const double C = 299800000;       //Speed of light in vacume (meters per second)
	const double joule_to_ev=6.242e+18;
	double wavelength=100;
	double nm_to_meter=1e+9;
	ifstream MyReadFile("wavelengths.txt");
	ofstream MyFile("calculations.txt");
	while (MyReadFile>>wavelength) {
		double ans=(H*C)/wavelength*nm_to_meter*joule_to_ev;
		// Write to the file
		MyFile <<wavelength<<" "<<setprecision(5)<<ans<<endl ;

	}

	return 0;
}