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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        sc.nextLine();
        String lvl = sc.nextLine();
        int level = 0;
        int v = 0;
        for(int i=0; i < n; i++){
            if(lvl.charAt(i) == 'U'){
                if(level == -1){
                    v++;
                }
                level++;
            } else{
                level--;
            }
        }
        
        System.out.println(v);
       
    }
}