#include <cstdio>

#define BASE 100

using namespace std;

FILE*f = fopen("nunta.in" , "r");
FILE*g = fopen("nunta.out" , "w");

char v1[105] , v2[105];
short int n;

void adun(char A[] , char B[]);
void copie(char A[] , char B[]);
void afis(char A[]);

int main() {
    fscanf(f , "%hd" , &n);

    v1[1] = v1[0] = 1;
    v2[1] = v2[0] = 1;

    for (short int i = 1; i <= n; ++i) {
        adun(v2 , v1);
    }

    afis(v2);
}

void adun(char A[] , char B[]) {
    short int t = 0;

    A[0] = B[0];
    for (short int i = 1; i <= B[0]; ++i) {
        short int x , aux;
        x = A[i];
        A[i] = B[i];

        aux = B[i] + t + x;
        t = aux / BASE;
        B[i] = aux % BASE;
    }

    while (t) {
        B[++B[0]] = t % BASE;
        t /= BASE;
    }
}

void copie(char A[] , char B[]) {
    for (short int i = 1; i <= A[0]; ++i) {
        A[i] = 0;
    }
    A[0] = 0;

    for (short int i = 0; i <= B[0]; ++i) {
        A[i] = B[i];
    }
}


void afis(char A[]) {
    fprintf(g , "%d", A[A[0]]);
    for (short int  i = A[0] - 1; i > 0; --i) {
        short int x = (short int)A[i] , nr = 0;
        if (x == 0)
            nr = 1;

        while (x) {
            ++nr;
            x /= 10;
        }

        for(short int j = nr + 1; j <= 2; ++j) {
            fprintf(g , "0");
        }

        fprintf(g , "%d", (int)A[i]);
    }
}