The formula for the speed $S$ of a wave is $S=f\lambda$, where $f$ is the frequency in Hertz and $\lambda$ (lambda) is the wavelength in meters. A wave generator produces waves with a constant frequency of 300 Hertz. The wavelength $\lambda$ of the waves can be adjusted, and it is related to a setting $n$ by the equation $\lambda =\frac{100}{n}$, where $n$ is a positive integer. If the speed of the waves must be at least 2000 meters per second, what is the greatest possible integer value of $n$?