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

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = Integer.parseInt(scan.nextLine());
        String steps = scan.nextLine();
        char[] stepsArr = steps.toCharArray();
        
        int uCount = 0;
        int dCount = 0;
        int valleyCount = 0;
        for(char step : stepsArr) {
            if(step == 'U') {
                uCount++;
            } else {
                dCount++;
            }
            
            if(dCount == uCount && step == 'U') {
                valleyCount++;
                uCount = 0;
                dCount = 0;
            }
        }
        
        System.out.println(valleyCount);
    }
}