import java.util.*;

class Main {

	private static final int YEAR = 2015;
	private static final int MONTH = 0;
	private static final int DATE = 1;

	public static void main(String[] args) {

		/* メイン処理開始 */
		// 変数初期化
		int result = 0;
		Calendar calendar = Calendar.getInstance();
		calendar.set(YEAR, MONTH, DATE);
		int monthMin = calendar.getMinimum(Calendar.MONTH);
		int monthMax = calendar.getMaximum(Calendar.MONTH);
		// 結果設定
		for (int i = monthMin; i <= monthMax; i++) {
			int dateMin = calendar.getMinimum(Calendar.DATE);
			int dateMax = calendar.getMaximum(Calendar.DATE);
			for (int j = dateMin; j <= dateMax; j++) {
				if (i + 1 == (j % 10 + j / 10 % 10)) {
					result++;
				}
			}
			calendar.roll(Calendar.MONTH, true);
		}
		/* メイン処理終了 */

		// 結果出力
		System.out.println(result);
	}
}