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

int main()
{
    vector<int> months={0,31,28,31,30,31,30,31,31,30,31,30,31};
    int count=0;
    for(int day=1;day<32;day++)
    {
        int num=day%10+day/10;
        if(months[num]>=day)count++;
    }
    printf("%d",count);
}