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 s = new Scanner(System.in);
        int size = s.nextInt();
        String path = s.next();
        int height = 0;
       
        boolean startOfValley=false;

        int count = 0;
        for(int i = 0; i < size; i++){
            Character c = path.charAt(i);
            if(c == 'U'){
                height++;
            }
            if(c == 'D'){
                height--;
            }
            
            
            if(height == -1){
                startOfValley = true;
                continue;
            }
            
            if(startOfValley && height == 0){
                count++;                
                startOfValley = false;
            }
        }

        System.out.println(count);
        
    
    
    }
}