100元买100只鸡，其中公鸡5元1只，母鸡3元1只，小鸡1元3只，要求每种鸡至少有1只，要求编写程序统计并输出所有购买方案。-100 yuan to buy 100 chickens, of which 5 yuan a rooster, hen 3 per 1, chicken 1 per 3 to require at least one of each chicken, statistics and programming required to purchase the output