#include<iostream>
#include<stdio.h>
#include<vector>
#include<map>

using namespace std;

int main(){

    vector<int> month{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    int cnt = 0;
    for(int i=0; i<(int)month.size(); i++){
        for(int j=1; j<month[i]; j++){
            if(i+1 == (j%10)+(j/10)){
                cnt++;
            }
        }
    }

    cout<< cnt<< endl;

    return 0;
}