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();
        in.nextLine();
        String cas = in.nextLine();
        int valley = 0;
        int level = 0;
        for(int i=0; i<cas.length(); i++){
            if(cas.charAt(i)=='U'){
                level++;
            }
            if(cas.charAt(i)=='D'){
                if(level==0){
                    valley++;
                }
                level--;
            }
        }
        
        System.out.println(valley);
    }
}