#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> VI;
typedef vector<VI> VVI;
#define REP(i, n)           for(int(i)=0;(i)<(n);++(i))
#define FOR(i, f, t)        for(int(i)=(f);(i)<(t);(++i))
#define RREP(i, n)          for(int(i)=(n)-1;(i)>=0;--(i))
const int MOD = int(1e9+7);

int N,M,W,H;
int res = 0;

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

int main(){
    do { cin.tie(0); ios_base::sync_with_stdio(false); } while(0);

    int c = 0;
    REP(i,12){
        int m = i+1;
        REP(d,day[i]){
            int d1 = (d+1) / 10, d2 = (d+1) % 10;
            if(m == d1+d2)c++;
        }
    }

    cout << c << endl;
    return 0;
}