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 and M, where N 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

题意：

给你n, m表示2001年m月的第n天，问你这一天是星期几，如果这一天不存在，就输出Impossible。
水题，不想讲

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int mon[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int main()
{
    int n, m, sum = 0;
    cin >> n >> m;
    if (n > mon[m])
        puts("Impossible");
    else
    {
        for (int i = 1; i < m; i++)
            sum += mon[i];
        sum += n;
        int ans = sum % 7;
        if (!ans)
            ans = 7;
        cout << ans;
    }
    return 0;
}