If our atmosphere had a uniform density of $1\mathrm{.}25k\frac{g}{m^3}$ all the way up to a border with empty space above, that border would be $,km$ above sea level. The pressure at sea level is $1$atm$={10}^5\frac{N}{m^2}$ and $g=10\frac{m}{s^2}.$ Enter your answer as an integer.