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 sc = new Scanner(System.in);
        int numSteps = sc.nextInt();
        sc.nextLine();
        String steps = sc.nextLine();
        int level = 0;
        int valley = 0;
        for(int i=0; i<steps.length(); i++){
            boolean isValley = false;
            if(level == 0){
                isValley = true;
            }
            if(steps.charAt(i) == 'U'){
                level++;
            }
            else if(steps.charAt(i) == 'D'){
                level--;
            }
            if(isValley && level == -1){
                valley++;
            }
        }
        System.out.println(valley);
    }
}