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


int main() {
  int n;
  string ud;
  cin >> n;
  cin >> ud;
  
  // lvl = 0 implies sea level
  int lvl = 0;
  int n_valley = 0;
  
  for (auto c:ud) {
    if ('U'==c) {
      lvl++;
    
      n_valley += (0==lvl);
    } else if ('D'==c) {
      lvl--;
    }
  }
  
  printf("%d\n", n_valley);
  
  return 0;
}