import java.io.*;
import java.util.*;
import java.lang.String;

public class Solution {

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