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 len = sc.nextInt();
        String map = sc.next();
        // Sea level = 0, Mountain = 1, Valley = -1
        int state = 0, valleyCnt = 0, sum = 0;
        for(int i = 0; i < len; i++) {
            
            char c = map.charAt(i);
            
            if(state == 0 && c == 'D') {
                valleyCnt++;
            }
               
            if(c == 'U') {
                sum++;
            } else {
                sum--;
            }
            
            if(sum > 0) {
                state = 1;
            } else if(sum == 0) {
                state = 0;
            } else {
                state = -1;
            }
            
        }
        
        System.out.println(valleyCnt);
    }
}