An Inventor Claims To Have Developed A Power Cycle Operating Between Hot And Col

an inventor claims to have developed a power cycle operating between hot and cold reservoirs at 1000K and 250K respectively, that develops net work equal to a multiple of the amount of energy, Qc, rejected to the cold reservoir- that is Wcycle = NQc where all quantities are postive. what is the maximum theoretical value of the number N for any such cycle.