115. Calendar
time limit per test: 0.25 sec.
memory limit per test: 4096 KB
First year of new millenium is gone away. In commemoration of it write a program that finds the name of the day of the week for any date in 2001.
Input
Input is a line with two positive integer numbers N andM, whereN is a day number in month
M. N and M is not more than 100.
Output
Write current number of the day of the week for given date (Monday – number 1, … , Sunday – number 7) or phrase “Impossible” if such date does not exist.
Sample Input
21 10
Sample Output
7
输入n，m输出2011年m月n日是星期几，如果日期不存在输出Impossible