#include<bits/stdc++.h>
using namespace std;
int main(){
	int days[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	int ans = 0;
	for(int i=1;i<13;i++){
		int dayMax = days[i];
		for(int day=1;day<dayMax+2;day++){
			if(i+1==day/10+day%10)ans++;
		}
	}
	cout<<(ans)<<endl;
	return 0;
}