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. */
        int n = 0;
        Scanner sc = new Scanner(System.in);
        int up  = 0 ;
        n = sc.nextInt();
        char a[] = sc.next().toCharArray();
        int v_start  = 0;
        int no_of_v = 0;
        for(int i = 0; i < n ; i++){
            if (a[i] == 'U')
                up++;
            if(a[i] == 'D')
                up--;
            if(up < 0)
                v_start = 1;
            if(v_start == 1 && up == 0){
                no_of_v++;
                v_start = 0;
            }
        }
        System.out.println(no_of_v);
        
    }
}