#include <iostream>
#include <cstdio>
#include <cstring>
#define mod 1000000000
using namespace std;
int d[1000005];
int main()
{
    memset(d,0,sizeof(d));
    d[1]=1;
    d[2]=2;
    int n;
    scanf("%d",&n);
    for(int i=3;i<=n;i++)
    {
        d[i]=d[i-1];
        i++;
        d[i]=(d[i-1]%mod+d[i/2]%mod)%mod;
    }
    printf("%d\n",d[n]);
    return 0;
}