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

for i in range(1,n+1):
    u_tmp = u
    v_tmp = v
    u = u + v - w
    v = u_tmp - v + w
    w = (u_tmp - v_tmp) / w

print('u =',u,', v =',v,', w =',w)