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 in = new Scanner(System.in);
        int totalSteps = in.nextInt();
        String steps = in.next();
        
        int sea_level = 0;
        int current = sea_level;
        int total_valleys = 0;
        boolean is_below_sea_level = false;
        
        for(int i = 0 ; i < totalSteps ; i++){
            char step = steps.charAt(i);
            
            if (step == 'U') {
                current++;
                
                if(is_below_sea_level && current == sea_level){
                    total_valleys++;
                }
            } 
            
            
            if (step == 'D') {
                current--;
                
                if(current < 0){
                    is_below_sea_level = true;
                }
                
            }
            
        }
        
        
        System.out.println(total_valleys);
    }
}