import math
from __future__ import division
#initialisation of variables
r=6.4*10**6; #radius in metre
v=(4/3)*3.14*r*r*r; #calculating volume
m=6.0*10**24; #mass in kg
#CALCULATIONS
d=m/v; #calculating density
#RESULT
print"Density in kg/m cube =",round(d,3);