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 steps = Integer.parseInt(in.nextLine());
        char[] ud = in.nextLine().toCharArray();
        int elevation = 0;
        int valleyNum = 0;
        for(int i = 0; i < steps; i++) {
            if(ud[i] == 'U') {
                elevation++;
            } else {
                if(elevation == 0) {
                    valleyNum++;
                }
                elevation--;
            }
        }
        System.out.println(valleyNum);
    }
}