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 in =  new Scanner(System.in);
        int N = in.nextInt();
        String str = in.next();
        String step;
        int level = 0;
        int early;
        int valleys = 0;
        for (int i=0; i<N; i++){
            step = Character.toString(str.charAt(i));
            early = level;
            if ("U".equals(step)){
                level += 1;
            } else{
                level -= 1;
            }
            if ((level == -1) && (early==0)){
                valleys ++;
            }
        }     
        System.out.println(valleys);
    }
}