#include<bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define p(s) cout<<(s)<<endl
#define p2(s, t) cout << (s) << " " << (t) << endl
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl

int cal[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};

ll f(ll day){
    ll sum = 0;
    while(day!=0){
        sum += day%10;
        day /= 10;
    }
    return sum;
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll count = 0;

    FOR(m, 1, 13){
        FOR(d, 1, cal[m]+1){
            if(m==f(d)) count++;
        }
    }
    p(count);

    return 0;
}