import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        int numberSteps = sc.nextInt();
        int valleyCount = 0;
        int seaLevel = 0;
        String steps = sc.next();
        boolean bellow = false;

        for ( int i = 0; i < numberSteps; i++ ) {
            seaLevel += steps.charAt(i) == 'U' ? 1 : (-1);
            if (seaLevel < 0 && !bellow) {
                valleyCount++;
                bellow = true;
            } else if (seaLevel >= 0 && bellow)
                bellow = false;
        }
        
        System.out.println(valleyCount);
    }
}