#include<iostream>
#include<iomanip>
#include<algorithm>
#include<vector>
#include<string>
#include<math.h>

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) for(int i=0;i<(n);i++)
#define ALL(i) (i).begin(),(i).end()
#define rALL(i) (i).rbegin(),(i).rend()
#define debug(x) cout<<#x<<": "<<x<<endl
#define pi M_PI

typedef long long ll;
typedef unsigned long long ull;

using namespace std;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
/*-------- code --------*/
    int A[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int c = 0;
    
    FOR(i,1,13){
        FOR(j,1,A[i-1]+1){
            if(i == ((j/10) + (j%10))) c++;
        }
    }

    cout << c << endl;
}