import std.c.stdio;
import std.stdio;

 // number of kilometers in a astronomical unit 
const real au = 148800000.0;
 // number of kilometers in a light year based on light second being exactly 300,000km
const real ly = 9467280000000.0;
real n;
real x;
real y;

int main()
in
{
	assert(au is 148800000.0); // ensure that au is exactly 1,448,800,000km
	assert(ly is 9467280000000.0); // ensure that ly is exactly 9,467,280,000,000km
}
body
{
	writef("Enter number of light years: ");
	scanf("%f", x);
	
	// convert light years to kilometers
	y = x * ly;
	
	 // convert kilometers to astonomical units
	n = y / au;
	
	writefln("\nThe number of astronomical units is %f", n );
	return 0;
}