def Xbonacci(signature,n):
    length=len(signature)
    for i in range(n-len(signature)):
        signature.append(sum(signature[-length:]))
    return signature[:n]
def Xbonacci(signature,n):
    length=len(signature)
    for i in range(n-len(signature)):
        signature.append(sum(signature[-length:]))
    return signature[:n]