#include <bits/stdc++.h>
using namespace std;
const int maxn = 200100;
int main() {
  int n, ans = 0, cnt = 0;
  string s;
  cin >> n >> s;
  for (int i = 0; i < n - 1; i++) {
    if (s[i] == 'U')
      cnt++;
    else
      cnt--;
    if (cnt == 0 && s[i] == s[i + 1]) ans++;
  }
  cout << ans;
  return 0;
}
