/* Compute the day name in a week by dd/mm/yyyy
 * Zeller Formular
 * c : century, first 2 bits of year
 * y : year   , last  2 bits of year
 * m : month  , if(m<3) m=m+12, y=y-1
 * d : days   
 * return : 1-6 for Mon, Tue, Wed ..., 0 for Sun.
 */
#include<cstdio>
 
int allow[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};	//only for 2001. typo WA here...WTF
int getWeek(int c, int y, int m, int d)
{
	return  (y + y/4 + c/4 - 2*c + (26*(m+1))/10 + d - 1)%7;
}
 
int main()
{
	int n,m,t;
	scanf("%d %d",&n,&m);	
	if(m>12 || n<1 || m<1 || n>allow[m]) printf("Impossible\n");
	else {
		if(m<3) t=getWeek(20,00,m+12,n);
		else t=getWeek(20,01,m,n);		
		if(t>0) printf("%d\n",t);
		else if(t<0) printf("%d\n",t+7);
		else printf("7\n");
	}
	return 0;
}