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 sc = new Scanner(System.in);
        int n = sc.nextInt();
        int valley=0;
        String s = sc.next();
        int t=0;
        for(int i=0;i<n;i++)
            {
            if(s.charAt(i)=='U')
                t=t+1;
            else if(s.charAt(i)=='D'){
                t=t-1;}
                if(t==0)
                 {
                if(s.charAt(i)=='U')
                    valley = valley+1;
            }
        }
        System.out.println(valley);
    }
}