import java.io.*;
import java.util.*;

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 scan = new Scanner(System.in);
        int steps = scan.nextInt();
        int level = 0;
        boolean below = false;
        int valleys = 0;
        String step = scan.next();
        for(int i = 0;i<step.length();i++){           
            switch(step.charAt(i)){
                case 'U':level = level + 1;
                if(below && level >= 0){below = false;}
                break;
                case 'D':level = level - 1;
                if(!below && level < 0){
                    below = true;
                    valleys = valleys + 1;
                    break;}
                default: break;                   
                }
            }
        System.out.println(valleys);
        }
        }