#include <fstream>

using namespace std;

ifstream cin("fibonacci.in");
ofstream cout("fibonacci.out");

long long c;

int fibo(long long n, long long a, long long b)
{
    if(n>2)
    {
        c=a+b;
        a=b;
        b=c;
        fibo(n-1, a, b);
    }
    return c;
}

int main()
{
    long long n;
    cin>>n;
    cout<<fibo(n, 1, 1)%982451653;
    return 0;
}