半年付息债券

def solve(____):
    semi_coupon = face_value * coupon_rate / ____
    semi_ytm = ytm / ____
    periods = maturity * ____
    price = sum(semi_coupon / (____ + semi_ytm) ** t for t in range(____, periods + ____))
    price += face_value / (____ + semi_ytm) ** periods
    return {"____": face_value, "____": coupon_rate, "____": ytm, "____": maturity, "____": round(____)}