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) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String steps = in.next();
        int height = 0; int valleys = 0; boolean inValley = false;
        for(int i = 0; i < n; i++) {
            if(steps.charAt(i) == 'U') height++;
            if(steps.charAt(i) == 'D') height--;
            if(height < 0) inValley = true;
            if(height == 0 && inValley) {
                inValley = false;
                valleys++;
            }
        }
        System.out.println(valleys);
    }
}