import time



def Fibo_brutalI(n):
    u,v = 0.,1.
    for i in range(2,n+1):
        u,v = v,u+v 
        
    return v
  
tps1 = time.clock()
print(Fibo_brutalI(1477))
tps2 = time.clock()

print(tps2 - tps1)