package yukicoder;

public class N188 {
	public static void main(String[] args){
		int i, j, hoge, c = 0;
		for(i = 1;i <= 12;++i){
			for(j = 1;j <= 31;++j){
				if(i == 2 && j >= 29){
					break;
				}else if((i == 4 || i == 6 || i == 9 || i == 11) && j >= 31){
					break;
				}
				hoge = j / 10;
				if(i == hoge + (j % 10)) ++c;
			}
		}
		
		System.out.println(c);
	}
}