import java.util.*;
import java.io.*;
import java.math.BigInteger;

public class Main {
    public static void main(String args[]) {
        BigInteger[] a = new BigInteger[400];
        a[0] = BigInteger.ONE;
        a[1] = BigInteger.ONE;
        for (int i = 2; i < 205; i++) {
            a[i] = a[i - 2].add(a[i - 1]);
        }

        Scanner cin = new Scanner(new BufferedInputStream(System.in));
        PrintWriter cout = new PrintWriter(new OutputStreamWriter(System.out), true);
        int n;
        while (cin.hasNext()) {
            n = cin.nextInt();
if(n==0)cout.println();
else cout.println(a[n]);
        }

        cin.close();
        cout.close();
    }

}