#include <bits/stdc++.h>
using namespace std;
int n, rsp, ans, taram;
char first;
int main() {
  cin >> n;
  cin >> first;
  if (first == 'U') {
    taram = 2;
    rsp++;
  } else
    taram = 1;
  for (int i = 2; i <= n; i++) {
    cin >> first;
    if (rsp * 2 == i - 1) {
      ans += (first == 'R' && taram == 2);
      ans += (first == 'U' && taram == 1);
      if ((first == 'R' && taram == 2) || (first == 'U' && taram == 1))
        taram = taram % 2 + 1;
    }
    if (first == 'U') rsp++;
  }
  cout << ans;
  return 0;
}
