#include<iostream>
using namespace std;
int main(){
	const int day[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
	int ans = 0;
	for (int m = 1; m <= 12; m++){
		for (int d = 0; d <= day[m]; d++){
			ans += (m == d / 10 + d % 10); //
		}
	}
	cout << ans << endl;
	return 0;
}