module main;

import std;

void main()
{
	// 答えの計算
	int ans = 0;
	int[] days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
	foreach (i; 0 .. 12) {
		foreach (j; 0 .. days[i]) {
			int month = i + 1;
			int day = (j + 1).to!string.map!"a - '0'".sum;
			ans += month == day;
		}
	}
	// 答えの出力
	writeln(ans);
}