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) {
        int count = 0;
        int seaLevel = 0;
        Scanner kb = new Scanner(System.in);
        int n = kb.nextInt();
        kb.nextLine();
        String s = kb.nextLine();
        
        char[] charArr = s.toCharArray();
                
        for(int i = 0; i < n ; i++){
           
            if(charArr[i] == 'D'){
                seaLevel -= 1;
            }
            else
                seaLevel += 1;
            
            if(seaLevel == -1 && charArr[i + 1] == 'U'){
                count += 1;
            }
            
       }
        
        System.out.print(count);
    }
}