package yukicoder;

public class Main {
	public static void main(String[] args) {
		try {
			int ans = 0;
			for (int i = 1; i <= 12; ++i) {
				for (int j = 0; j <= 3; ++j) {
					for (int k = 0; k < 10; ++k) {
						if (j * 10 + k <= 30 && i == j + k) {
							++ans;
						}
					}
				}
			}

			System.out.println(ans);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}