#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int digisum(int i){
    int sum1 = 0;
    while (i) {
        sum1 += i%10;
        i /= 10;
    }
    return sum1;
}

int main(){
    int cnt = 0;
    vector<int> m(12), d(12);
    for (int i = 1; i <= 12; i++) m[i-1] = i;
    for (int i = 1; i <= 12; i++){
        if (i == 2) d[i-1] = 28;
        else if (i == 4 || i == 6 || i == 9 || i == 11) d[i-1] = 30;
        else d[i-1] = 31;
    }
    for (int i = 0; i < 12; i++){
        for (int j = 1; j <= d[i]; j++){
            if (digisum(m[i]) == digisum(j)) cnt++;
        }
    }
    cout << cnt << endl;
}