import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
      Scanner scn = new Scanner(System.in);
      int n = scn.nextInt();
      scn.nextLine();
      String steps = scn.nextLine();
      int stepsSum = 0,counter = 0,v=0;  
      for(int i=0;i<n;i++){
        if(steps.charAt(i)=='U') ++stepsSum;
        else --stepsSum;
        if((stepsSum<0)&&steps.charAt(i)=='U'&&steps.charAt(i+1)=='D') continue;
        if(stepsSum<0)v++;
        else if(v>0&&stepsSum==0){v=0;counter++;}
      }
     
      System.out.println(counter);

    }
}