#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int main() {
  int n;
  cin >> n;

  int h = 0; // height
  int v = 0; // number of valleys
  
  string s;
  cin >> s;
  
  for (int i = 0; i < n; i++) {
    if (s[i] == 'D') {
      h -= 1;
    }
    else if (s[i] == 'U') {
      h += 1;
      if (h == 0) {
        v++;
      }
    }
  }

  cout << v;

  return 0;
}