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

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println(valleys(Integer.parseInt(sc.nextLine()), sc.nextLine().toCharArray()));
    }
                           
    private static int valleys(int steps, char[] dirs){
        int valleys = 0;
        int level = 0;
        for(char dir: dirs){
            if (level==0&&dir=='D')
                valleys++;
            if(dir=='D')
                level--;
            else if (dir=='U')
                level++;
        }
        return valleys;
    }
}