'''  Purpose:  introduce variable usage, assignment and hand-checking of code.
'''

n = 17
print( "n =", n ) 

s = 2 * n 
print( "s =", s )

t = s + 4
print( "t =", t ) 

u = t // 2
print( "u =", u ) 

v = u - n
print( "v =", v )

u = -5
print( "u =", u ) 

print( "v =", v )