albinute

#include <fstream>
#define MOD 2018
using namespace std;
ifstream f("albinute.in");
ofstream g("albinute.out");

int main()
{
    unsigned long long int n,nrop;
    f>>n;
    if(n%2)
        nrop=0,n/=2;
    else
        nrop=n/2,n=n/2-1;
    nrop=nrop+n%MOD*(n+1)%MOD;
    g<<nrop%MOD;
    return 0;
}