J4 JS

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner num = new Scanner(System.in);

        int D = num.nextInt();

        int Mins = 0;
        int Hour = 12;

        int Multiply = D/720;
        int Remainder = D%720;

        int counter = 0;
        for(int i=0; i<Remainder; i++){
            Mins++;
            if(Mins==60){
                Mins = 0;
                Hour++;
            }
            if(Hour==13){
                Hour = 1;
            }
            if(Mins<10){
                if(Hour==0&&Mins==0)
                    counter++;
            }
            if(Mins>=10){
                int tensMins = Mins/10;
                int onesMins = Mins%10;
                if(Hour<10)
                    if(Hour-tensMins==tensMins-onesMins)
                        counter++;
                else
                    if(Hour==11&&Mins==11)
                        counter++;
                    if(Hour==12&&Mins==34)
                        counter++;
            }
        }

        System.out.println(31*Multiply+counter);
    }
}