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 in = new Scanner(System.in);
        int n = Integer.parseInt(in.nextLine());
        char arr[] = in.nextLine().toCharArray();
        int seaLevel = 0;
        int preSeaLevel = 0;
        int valleys = 0;
        for(int arr_i=0; arr_i < n; arr_i++){
            if (arr[arr_i] == 'U' ) {
            	seaLevel++;
            }
            else if (arr[arr_i] == 'D' ) {
            	seaLevel--;
            }
            
            if (seaLevel == 0 && preSeaLevel == -1) {
            	valleys++;
            }
            preSeaLevel = seaLevel;
        }
        System.out.println(valleys);
        

    }
}