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);
        int n = in.nextInt();
        in.nextLine();
        String s = in.next();
        int seaLevel = 0;
        int lastSeaLevel = 0;
        int totalValleys = 0;
        for(int i = 0; i < n; i++){
            if(s.charAt(i) == 'U'){
                lastSeaLevel = seaLevel;
                seaLevel++;
            }
            else if(s.charAt(i) == 'D'){
                lastSeaLevel = seaLevel;
                seaLevel--;
            }
            if(!checkValley(seaLevel, lastSeaLevel)){
                totalValleys++;
            }
        }
        System.out.println(totalValleys);
    }
    public static boolean checkValley(int seaLevel, int lastSeaLevel){
        if(seaLevel == 0 && lastSeaLevel == -1){
            return false;
        }
        else{
            return true;
        }
    }
}