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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner in = new Scanner(System.in);
        in.nextLine();
        String path = in.nextLine();
        char[] steps = path.toCharArray();
        int elevation = 0;
        int valleys = 0;
        for(int i = 0; i < steps.length; i++){
            if(steps[i] == 'U'){
                if(elevation == -1){
                    valleys++;
                }
                elevation++;
            }
            else if(steps[i] == 'D'){
                elevation--;
            }
        }
        System.out.println(valleys);
        
    }
}