import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Main {
    public static void main(String[] args) {
        final BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        final BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        try {
            int T = 1;
            for (int i = 0; i < T; ++i) {
                Runner runner = new Runner(br, bw);
                runner.run();
                runner.flush();
            }
            br.close();
            bw.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }
}

class Solution {
    final String target = "2023";

    int solution(int N) {
        int res = 0;
        for (int i = 2022; i <= N; ++i) {
            var s = String.valueOf(i);
            if (isTarget(s))
                ++res;
        }
        return res;
    }

    boolean isTarget(String s) {
        int prevIdx = 0;
        for (int t = 0; t < target.length(); ++t) {
            var idx = s.substring(prevIdx).indexOf(target.charAt(t));
            if (idx == -1)
                return false;
            prevIdx += idx + 1;
        }
        return true;
    }
}

class Runner {
    final Reader reader;
    final BufferedWriter bw;

    final int N;

    Runner(BufferedReader br, BufferedWriter bw) {
        this.reader = new Reader(br);
        this.bw = bw;
        try {
            N = Integer.parseInt(br.readLine());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public void flush() {
        try {
            bw.write('\n');
            bw.flush();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    public void run() throws IOException {
        var sol = new Solution();
        var res = sol.solution(N);
        bw.write(String.valueOf(res));
    }
}

class Reader {
    private BufferedReader br;

    public Reader(BufferedReader br) {
        this.br = br;
    }
}