#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cstring>
#include <set>
#include <queue>
#include <vector>
#include <iostream>
using namespace std;
#define ll long long
#define pb push_back
#define mkp make_pair
#define fi first
#define se second
#define FOR(i, l, r) for(int i = l; i <= r; i++)
#define ROF(i, r, l) for(int i = r; i >= l; i--)
#define all(a) a.begin(), a.end()
const int MAXN = 410;

struct bign{
    int len, s[MAXN];
    bign (){
        memset(s, 0, sizeof(s));
        len = 1;
    }
    bign (int num) { *this = num; }
    bign (const char *num) { *this = num; }
    void clean(){
        while(len > 1 && !s[len-1]) len--;
    }

    bign operator = (const int num){
        char s[MAXN];
        sprintf(s, "%d", num);
        *this = s;
        return *this;
    }
    bign operator = (const char *num){
        for(int i = 0; num[i] == '0'; num++) ;  //去前导0
        len = strlen(num);
        for(int i = 0; i < len; i++) s[i] = num[len - i - 1] - '0';
        return *this;
    }

    bign operator + (const bign &b) const{
        bign c;
        c.len = max(len, b.len);
        for(int i = 0; i < c.len; i++){
            c.s[i] += s[i] + b.s[i];
            if (c.s[i] >= 10) c.s[i] -= 10, c.s[i + 1]++;
        }
        if (c.s[c.len]) c.len++;
        return c;
    }
    void operator += (const bign &b){
        *this = *this + b;
    }

    bign operator * (const bign &b){
        bign c;
        c.len = len + b.len;
        for(int i = 0; i < len; i++)
            for(int j = 0; j < b.len; j++)
                c.s[i + j] += s[i] * b.s[j];
        for(int i = 0; i < c.len; i++){
            c.s[i + 1] += c.s[i] / 10;
            c.s[i] %= 10;
        }
        c.clean();
        return c;
    }
    void operator *= (const bign &b){
        *this = *this * b;
    }

    bign operator - (const bign &b){
        bign c;
        c.len = len;
        for(int i = 0; i < len; i++){
            c.s[i] += s[i] - b.s[i];
            if (c.s[i] < 0) c.s[i] += 10, c.s[i + 1]--;
        }
        c.clean();
        return c;
    }
    void operator -= (const bign &b){
        *this = *this - b;
    }

    bign operator / (const bign &b){
        bign c, f = 0;
        for(int i = len-1; i >= 0; i--){
            f = f * 10;
            f.s[0] = s[i];
            while(f >= b){
                f -= b;
                c.s[i]++;
            }
        }
        c.len = len;
        c.clean();
        return c;
    }
    void operator /= (const bign &b){
        *this  = *this / b;
    }

    bign operator % (const bign &b){
        bign r = *this / b;
        r = *this - r * b;
        return r;
    }
    void operator %= (const bign &b){
        *this = *this % b;
    }

    bool operator < (const bign &b){
        if(len != b.len) return len < b.len;
        for(int i = len - 1; i >= 0; i--){
            if(s[i] != b.s[i]) return s[i] < b.s[i];
        }
        return false;
    }
    bool operator > (const bign &b){
        if(len != b.len) return len > b.len;
        for(int i = len - 1; i >= 0; i--){
            if(s[i] != b.s[i]) return s[i] > b.s[i];
        }
        return false;
    }
    bool operator == (const bign &b){
        return !(*this > b) && !(*this < b);
    }
    bool operator != (const bign &b){
        return !(*this == b);
    }
    bool operator <= (const bign &b){
        return *this < b || *this == b;
    }
    bool operator >= (const bign &b){
        return *this > b || *this == b;
    }

    string str() const{
        string res = "";
        for(int i = 0; i < len; i++) res = char(s[i]+'0') + res;
        return res;
    }
};

istream& operator >> (istream &in, bign &x){
    string s;
    in >> s;
    x = s.c_str();
    return in;
}

ostream& operator << (ostream &out, const bign &x){
    out << x.str();
    return out;
}

int n;
bign f[401];

int main(){
    f[0] = f[1] = 1;
    for(int i = 2; i <= 400; i++)
        f[i] = f[i - 1] + f[i - 2];
    while(~scanf("%d", &n)){
        if(n == 0) cout << '\n';
        else cout << f[n] << '\n';
    }
  return 0;
}
/*
                   _ooOoo_
                  o8888888o
                  88" . "88
                  (| -_- |)
                  O\  =  /O
               ____/`---'\____
             .'  \\|     |//  `.
            /  \\|||  :  |||//  \
           /  _||||| -:- |||||-  \
           |   | \\\  -  /// |   |
           | \_|  ''\---/''  |   |
           \  .-\__  `-`  ___/-. /
         ___`. .'  /--.--\  `. . __
      ."" '<  `.___\_<|>_/___.'  >'"".
     | | :  `- \`.;`\ _ /`;.`/ - ` : | |
     \  \ `-.   \_ __\ /__ _/   .-` /  /
======`-.____`-.___\_____/___.-`____.-'======
                   `=---='
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
         佛祖保佑       永无BUG
*/