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) {
       /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        String input=sc.next();
        
        int[] arr=new int[n];
        for(int i=0;i<n;i++){
            if(input.charAt(i)=='U'){
                arr[i]=0;
            }
            else arr[i]=1;
        }
        
        int numOfOnes=0,valleys=0,numOfZeroes=0;
        
        for(int i=0;i<n;i++){
            if(arr[i]==1){
               numOfOnes++; 
            }
            else numOfZeroes++;
            if(arr[i]==0){
                if(numOfOnes==numOfZeroes){
                    valleys++;
                }
            }
        }
        System.out.print(valleys);
    }
}