#include<bits/stdc++.h>

using namespace std;
using ll=long long;
#define rep2(i, a, n) for(int i = (a); i < (n); i++)
#define rep(i, n) rep2(i,0,n)

int main(){
  cin.tie(nullptr);ios_base::sync_with_stdio(false);
  int cnt=0,days[12]={31,28,31,30,31,30,31,31,30,31,30,31};
  string d,m;
  rep(i,12){
    d="",m="";
    rep(j,days[i]){
      if(i+1<10)d+='0';
      if(j+1<10)m+='0';
      d+=to_string(i+1);
      m+=to_string(j+1);
      if(d[0]-'0'+d[1]-'0'==m[0]-'0'+m[1]-'0')cnt++;
    }
  }
  cout<<cnt<<endl;
}