public class HappyDay {

	public static void main(String[] args) {

		int day[]={31,28,31,30,31,30,31,31,30,31,30,31};
		
		int happy=0;
		
		for(int M=1; M<12; M++){
			for(int D=1; D<day[M-1]; D++){
				int D1 = D/10;
				int D2 = D%10;
				if(M==D1+D2){
					happy++;
				}
			}
		}
		
		System.out.println(happy);
		
	}

}