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

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();

        char[] step = scan.next().substring(0, n).toCharArray();

        int sum = 0;//sea level == 0
        int oldSum = 0;//when we going to first time minus - we in VALLEY
        int countValleys = 0;
        for(int i = 0; i < n; i++) {
            if(step[i] == 'U')
                sum += 1;
            else
                sum += -1;

            if(sum < 0 && oldSum >= 0)
                countValleys++;
            oldSum = sum;
        }
        System.out.println(countValleys);
    }
}