#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  long long n, k, m, x, ans = 0;
  cin >> n >> k >> m;
  vector<pair<long long, long long> > v;
  for (int i = 0; i < n; i++) {
    cin >> x;
    if (v.empty() || (v.back().first != x)) {
      v.push_back({x, 1});
    } else if (v.back().first == x) {
      v.back().second = (v.back().second + 1) % k;
      if (v.back().second == 0) v.pop_back();
    }
  }
  if (v.size() == 0) return cout << 0, 0;
  if (v.size() == 1) {
    return cout << ((v[0].second * m) % k), 0;
  }
  for (auto &i : v) {
    ans += m * i.second;
  }
  if (m == 1) return cout << ans, 0;
  long long rem = 0;
  int back = v.size() - 1, front = 0;
  while (back > front) {
    if ((v[front].first != v[back].first)) {
      break;
    } else {
      rem += ((v[front].second + v[back].second) -
              ((v[front].second + v[back].second) % k)) *
             (m - 1);
      if ((v[front].second + v[back].second) % k) break;
    }
    back--;
    front++;
  }
  if (back == front) {
    rem += ((v[back].second) * m) - ((v[back].second) * m) % k;
    if (((v[back].second) * m) % k == 0) {
      back--;
      front++;
    }
  }
  if (back < front)
    while (back >= 0) {
      if ((v[front].first != v[back].first)) {
        break;
      } else {
        rem += ((v[front].second + v[back].second) -
                ((v[front].second + v[back].second) % k));
        if ((v[front].second + v[back].second) % k) break;
      }
      back--;
      front++;
    }
  cout << (ans - rem);
  return 0;
}
