import java.io.*;
import java.util.*;
class MyScanner {
    BufferedReader br;
    StringTokenizer st;
 
    public MyScanner() {
        br = new BufferedReader(new InputStreamReader(System.in));
    }
 
    String next() {
        while (st == null || !st.hasMoreElements()) {
            try {
                st = new StringTokenizer(br.readLine());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return st.nextToken();
    }
 
    int nextInt() {
        return Integer.parseInt(next());
    }
 
    long nextLong() {
        return Long.parseLong(next());
    }
 
    double nextDouble() {
        return Double.parseDouble(next());
    }
 
    String nextLine(){
        String str = "";
        try {
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
    }
}
public class Solution {

    public static void main(String[] args) {
          MyScanner input = new MyScanner();
          int nrSteps = input.nextInt();
          String steps = input.nextLine();
          boolean underSea = false;
          int level = 0;
          int count = 0;
          for(int i = 0; i < steps.length(); i++){
              
              if(steps.charAt(i) == 'U'){
                  level++;
              }
                  
              else{
                level --;
                
              }
              if(level == 0 && underSea == true)
                count ++;
              if(level >= 0)
                  underSea = false;
              else
                  underSea = true;
          
          }
           
        System.out.println(count);
    }
}