import java.util.Scanner;

class no188{
	public static void main(String[] args) {
		Scanner stdIn=new Scanner(System.in);
		int a[]= {31,28,31,30,31,30,31,31,30,31,30,31},i,j,s=0;
		for(i=0;i<12;i++) for(j=a[i];j>0;j--) if(i+1==j/10%10+j%10) s++;
		System.out.print(s);
	}
}