public class Main {
	public static void main(String[] args) {
		int ans = 0, count = 1;
		for (int x = 1; x <= 12; x++) {
			for (int y1 = 0; y1 <= 2; y1++) {
				for (int y2 = 0; y2 < 10; y2++) {
					ans = y1 + y2;
					if (ans == x) {
						count++;
					}
				}
			}
		}
		System.out.println(count);
	}
}