题目：输入某年某月某日，判断这一天是这一年的第几天？
1.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。(Question: enter a certain year, a certain day, to judge the day is the next day of the year?
1. program analysis: taking March 5th as an example, we should add up the first two months, and then add the 5 days, the day of the year, and the special day of the year.
In the case of a leap year and the input month is greater than 3, one more day should be considered.)