#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG_
#include <compe/debug.hpp>
#else
#define dump(...)
#endif

#define FastIO cin.tie(nullptr), ios_base::sync_with_stdio(false);
#define rep(i, n) for (int i = 0; (int)i < n; ++i)
#define repa(i, a, n) for (int i = a; (int)(i) < (n); (++i))
#define rrep(i, n) for (int i = (n - 1); (int)i >= 0; --i)
#define rrepa(i, a, n) for (int i = a; (int)i >= 0; --i)
#define EACH(x, a) for (auto& x : a)
#define output(msg) cout << (msg) << '\n'
#define die(msg)         \
  do {                   \
    cout << msg << endl; \
    exit(0);             \
  } while (0)

template <class A> void read(vector<A>& v);
template <class A, size_t S> void read(array<A, S>& a);
template <class T> void read(T& x) {
  cin >> x;
}
void read(double& d) {
  string t;
  read(t);
  d = stod(t);
}
void read(long double& d) {
  string t;
  read(t);
  d = stold(t);
}
template <class H, class... T> void read(H& h, T&... t) {
  read(h);
  read(t...);
}
template <class A> void read(vector<A>& x) {
  EACH(a, x) read(a);
}
template <class A, size_t S> void read(array<A, S>& x) {
  EACH(a, x) read(a);
}
template <typename T> bool chmax(T& a, const T& b) {
  return ((a < b) ? (a = b, true) : (false));
}
template <typename T> bool chmin(T& a, const T& b) {
  return ((a > b) ? (a = b, true) : false);
}

using llint = long long int;

int main() {
  FastIO;

  int n, s, diff;
  read(n, s, diff);

  vector<int> shop_id;
  int cur{10000};
  rep(i, n) {
    int a;
    read(a);

    if (abs(s - a) <= diff) {
      if (chmin(cur, abs(s - a))) {
        shop_id.push_back(i + 1);
      }
    }
  }

  if (shop_id.size() == 0) die("Unlucky!");

  sort(shop_id.begin(), shop_id.end());
  output(shop_id.front());
}