#include <iostream>
using namespace std;

#define rep(i,n) for(int i=0;i<n;i++)
int main(void){
    
    int ans = 0;
    
    rep(i,13) {
        rep(j,32) {
            if(i == 4 && j == 31);
            else {
                int plus = (j / 10);
                plus += j - plus*10;
                if(i == plus)ans++;
                
            }
        }
    }
    cout << ans << endl;
    
}