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 steps = (int)Integer.parseInt(in.nextLine());
        String path = in.nextLine();
        int elevation = 0;
        int valleys = 0;
        int prevElevation = 0;
        
        for (int i = 0; i < path.length(); i++){
            if (path.charAt(i) == 'U') {
                prevElevation = elevation++;
            } else if (path.charAt(i) == 'D') {
                prevElevation = elevation--;
            }

            if (elevation < 0 && prevElevation >=0){
                valleys++;
            }
        }
        
        System.out.println(valleys);
    }
}