#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <math.h>
using namespace std;

int main() {
    int ans = 0;
    int month[12] = {31,28,31,30,31,30,31,31,30,31,30,31};
    for(int i = 1;i <= 12;i++){
        for(int j = 1;j <= month[i-1];j++){
            if(i == j%10 + (j/10)%10)ans++;
        }
    }
    cout << ans;
    
    return 0;
}