#include <bits/stdc++.h>
using namespace std;
const long long INF = 10000000000000007;
const long long mod = 1000000007;
typedef long long ll;
typedef pair<int, int> P;

int main()
{
  int n;
  cin >> n;
  cout << setprecision(10);
  vector<double>dp(n+1);
  dp[1] = 0;
  for (int i = 1; i < n; i++) {
      dp[i+1] = dp[i] + (double)n/(n-i); 
  }
  cout << dp[n] << endl;
}

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (long long i = 0; i < (n); ++i)
using ll = long long;
using P = pair<ll,ll>;
using vec = vector<ll>;
using vecp = vector<P>;
using mat = vector<vec>;
using matp = vector<vecp>;
const ll MOD = 998244353;
const ll INF = 1e18;
#define all(v) v.begin(), v.end()


int main(){
  ll N;
  cin >> N;
  if(N%2==0){
    cout << "White" << endl;
  }else{
    cout << "Black" << endl;
  }
}
      