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

public class Solution {

    public static void main(String[] args) throws Exception {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        String input = in.readLine();
        int s = Integer.parseInt(input);
        input = in.readLine();
        int array[] = new int[s];
        for(int i = 0; i < input.length(); ++i) {
            char c = input.charAt(i);
            
            if(c == 'U')
                array[i] = 1;
            if(c == 'D')
                array[i] = -1;
        }
        
        int res = 0;
        int start = 0;
        for(int i = 0; i < s; ++i) {
            start += array[i];
            
            if(array[i] == -1 && start == -1)
                ++res;
        }
        
        System.out.println(res);
    }
}