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();
        char[] path = in.next().toCharArray();
        
        int level = 0;
        int prevLevel = 0;
        int numberOfValleys = 0;
        for (int i = 0; i < n; i++) {
            char nextStep = path[i];
            if (nextStep == 'U') {
                level++;
            } else {
                level--;
            }
            if (prevLevel == 0) {
                if (level < 0) {
                    numberOfValleys++;
                }
            }
            prevLevel = level;
        }
        System.out.println(numberOfValleys);
    }
}