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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String s = in.next();
        int level = 0;
        int valley = 0;
        for(int i=0; i<n; i++){
            if (s.charAt(i) == 'U') {
                level++;
                if (level == 0) valley++;
            } else level--;
        }
        System.out.println(valley);
    }
}