#include <iostream>
#include <string>
#define REP(i,n) for(int i=0;i<(n);++i)
#define PB push_back
using namespace std;

int x = 31,y = 30,z = 28;
int dmax[] = {x,z,x,y,x,y,x,x,y,x,y,x};

int main(){
  int r = 0;
  REP(i, 32){
    int m = i / 10 + i % 10;
    if(m >= 1 && m <= 12 && dmax[m-1] >= i){
      ++r;
    }
  }
  cout << r << endl;
}