import java.text.DateFormat;

/**
 * No.188 HAPPY DAY
 */
public class HappyDay {

    public static void main(String[] args) {

        final int year = 2015;
        int tensPlace = 0;
        int onePlace = 0;
        int resNum = 0;
        String str = "";

        DateFormat format = DateFormat.getDateInstance();
        format.setLenient(false);

        for (int day=1; day<=31; day++) {
            tensPlace = (int) Math.floor(day / 10);
            onePlace = day % 10;
            str = year + "/" + (tensPlace + onePlace) + "/" + tensPlace + "" + onePlace;
            	try {
	                format.parse(str);
	                resNum++;
	            } catch (Exception ex) {
	                // 何もしない
	            }
        }
        System.out.println(resNum);
    }
}