#include <fstream>

using namespace std;
ifstream f("nunta.in");
ofstream g("nunta.out");
int n;
short int a[101][300];
int main()
{
    f>>n;
    a[1][0]=a[2][0]=1;
    a[1][1]=a[2][1]=1;
    for (int i=3; i<=n+1; i++)
    {
        a[i][0]=a[i-1][0];
        for(int j=1;j<=a[i][0];j++)
        {
            a[i][j]+=a[i-1][j]+a[i-2][j];
            a[i][j+1]+=a[i][j]/10;
            a[i][j]%=10;
        }
        if(a[i][a[i][0]+1]!=0)
        {
            a[i][0]++;
        }
    }
    for(int i=a[n+1][0];i>=1;i--)
    {
        g<<a[n+1][i];
    }
    return 0;
}