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 scanner = new Scanner(System.in);
        int N = scanner.nextInt();
        String hike = scanner.next();
        char[] ch = hike.toCharArray();
        int down = 0;
        int up = 0;
        int count=0;
        boolean flag = false;
        boolean next = false;
        for(int i=0;i<ch.length;i++)
            {
            if(ch[i]=='U'){
                up++;
            }
            if(ch[i]=='D'){
                up--;
                if(up<0)
                    flag = true;
            }
            if(up==0 && flag){
                flag = false;
                count++;
                up=0;
            }
            
        }
        System.out.println(count);
    }
}