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 scanner = new Scanner(System.in);
        int stepsNumber = scanner.nextInt();
        char[] steps = scanner.next().toCharArray();
        int level = 0;
        boolean valley = false;
        int valleyNumbers = 0;
            
        for (char c : steps) {
            if(c == 'U') level++;
            else level--;
            if(level < 0 && valley == false) {
        	valley = true;
        	valleyNumbers++;
            }
            if(level >= 0) valley = false;
            
        }
        
        System.out.println(valleyNumbers);

    }
}