#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int n;
  string s;
  cin >> n >> s;
  vector<pair<char, int>> rle = { { s[0], 0 } };
  for (char c : s) {
    if (rle.back().first == c) {
      rle.back().second++;
    }
    else {
      rle.push_back({ c, 1 });
    }
  }
  cout << rle.size() << endl;
  return 0;
}