u, v, w = [1], [2], [3]
n = 7

for k in range(1,n+1):
    u.append( u[k-1] + v[k-1] - w[k-1] )
    v.append( u[k-1] - v[k-1] + w[k-1] )
    w.append( (u[k-1] - v[k-1]) / w[k-1] )

print('u =',u[n],', v =',v[n],', w =',w[n] )