#include "stack.h"

#include <iostream>
#include <vector>

int main() {
  int n, m;
  std::cin >> n >> m;

  std::vector<int> s(n);
  for (int& x : s) {
    std::cin >> x;
  }

  std::cout << sum_compressed_lengths(s, m) << "\n";
  return 0;
}