#include <bits/stdc++.h>
#pragma warning(disable : 4996)
#pragma comment(linker, "/STACK:336777216")
using namespace std;
int IT_MAX = 1 << 17;
const long long MOD = 1000000009;
const int INF = 0x3f3f3f3f;
const long long LL_INF = 0x3f3f3f3f3f3f3f3f;
const double PI = acos(-1);
const double ERR = 1e-8;
vector<pair<long long, long long> > Vu;
int main() {
  int N, K, M, i, j;
  scanf("%d %d %d", &N, &K, &M);
  for (i = 1; i <= N; i++) {
    int t;
    scanf("%d", &t);
    if (!Vu.empty() && Vu.back().first == t) {
      Vu.back().second++;
      if (Vu.back().second == K) Vu.pop_back();
    } else
      Vu.emplace_back(t, 1);
  }
  long long s = 0;
  for (auto it : Vu) s += it.second;
  if (M == 1 || s == 0) return !printf("%lld\n", s);
  s *= M;
  int st = 0, en = (int)Vu.size() - 1;
  while (st < en) {
    if (Vu[st].first != Vu[en].first) return !printf("%lld\n", s);
    if (Vu[st].second + Vu[en].second == K) {
      s -= (long long)(M - 1) * K;
      st++, en--;
      continue;
    }
    if (Vu[st].second + Vu[en].second > K) s -= (long long)(M - 1) * K;
    return !printf("%lld\n", s);
  }
  if (st == en) {
    long long x = Vu[st].second * M;
    if (x % K == 0) {
      return !printf("0\n");
    } else {
      return !printf("%lld\n", s - (x / K) * K);
    }
  }
  return 0;
}
