#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>
using namespace std;


int main(){
	int a[15]={31,28,31,30,31,30,31,31,30,31,30,31};
	int ans=0;
	for(int i=0;i<12;i++){
		int x=(i+1)/10+(i+1)%10;
		
		for(int j=1;j<=a[i];j++){
			int y=j/10+j%10;
			if(x==y)ans++;
		}
	}
	cout<<ans<<endl;

	return 0;
}