输入某年某月某日，判断这一天是这一年的第几天？

程序分析：以3月5日为例，应该先把前两个月的加起来，然后再加上5天即本年的第几天，特殊

　　　　　　情况，闰年且输入月份大于3时需考虑多加一天。-Input of a certain period of a day, this day is to determine the first few days this year? Program analysis: the March 5, for example, should the first two months combined, then add five days this year- the first few days, special circumstances, enter the month and leap year to be considered when more than 3 one day.