public class no188 {
    public static void main(String[] args) {
        int sum = 0;
        int[] days = {31,28,31,30,31,30,31,31,30,31,30,31};
        for (int i=1; i<=12; i++) {
            for (int j=1; j<=days[i-1]; j++) {
                if (i == (j%10 + j/10)) sum++;
            }
        }
        System.out.println(sum);
    }
}