[นกกะเต็นปักหลัก]

second day
1.Let $f(x)=\left[\,\frac{x}{1!} \right]+\left[\,\frac{x}{2!} \right]+\left[\,\frac{x}{3!} \right]+\cdot \cdot \cdot +\left[\,\frac{x}{2013!} \right]$.For an integer n.If the equation $f(x)=n$ has some real roots, then $n$ is called a "lucky number".How many luckers number are in the set ${1,3,5,\cdot \cdot \cdot ,2013}$