//No.188 HAPPY DAY
//http://yukicoder.me/problems/492
//20170417 1605

package no188;

public class No188 {
	public static void main(String[] args) {
		int happyCount;
		int[] monthMax = new int[]{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

		happyCount = 0;
		
		for(int i = 1; i <= 12; i++){
			for (int j = 1; j <= monthMax[i - 1]; j++) {
				if (i == j / 10 + j % 10) {
					happyCount++;
				}
			}
		}
		
		System.out.println(happyCount);
	}

}