def poly(list_, x_value):
    answer = 0
    for i in range(len(list_)):
        answer += (x_value**i)*list_[i]
    return answer

if __name__ == "__main__":
    print(poly([1, 2, 1], 2))
    print(poly([1, 0, 1, 0, 1], 2))
    print(poly([1, 0, 1, 0, 1], 3))