import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Scanner;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        Task solver = new Task();
        solver.solve(1, in, out);
        out.close();
    }

    static class Task {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            final int n = Integer.parseInt(in.next());
            long[] dp = new long[n];
            dp[n - 1] = 1;
            dp[n - 2] = 2;
            for (int i = n - 3; i >= 0; i--) dp[i] = dp[i + 1] + dp[i + 2];
            out.println(dp[0]);
        }

    }
}