// g++ -std=c++11 temp.cpp
#include <bits/stdc++.h>
using namespace std;

#define FOR(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define REP(i,n) FOR(i,0,n)
#define EACH(itr,v) for(auto itr:v)
#define pb(s) push_back(s)
#define mp(a,b) make_pair(a,b)
#define all(x) (x).begin(),(x).end()
#define dbg(x) cout<<#x"="<<x<<endl

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> P;
typedef pair<P, int> PPI;

#define INF INT_MAX/3

#define MAX_N 1000

int day[] = {31,28,31,30,31,30,31,31,30,31,30,31};

int main(){
	int res = 0;
	REP(i,12){
		REP(j,day[i]){
			int month = i+1, day = j+1;
			if(month == day/10 + day%10) res++;
		}
	}
	cout<<res<<endl;
	return 0;
}