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 scan = new Scanner(System.in);
        int n = scan.nextInt();
        String str = scan.next();
        char[] arr = str.toCharArray();
        
        boolean upFlag = false;
        boolean touchedSeaLevel = false;
        int count = 0;
        int totalCount = 0;
        int valleyCount = 0;
        for(char ch : arr){
            if(count == 0 && ch == 'U'){
                upFlag = true;
            }else if(count == 0 && ch=='D'){
                upFlag = false;
            }
            
            if(ch == 'U'){ count++; totalCount++; }
            if(ch == 'D'){ count--; totalCount++; }
            if(totalCount>0 && count == 0){ touchedSeaLevel = true; }
            if(totalCount>0 && !upFlag && touchedSeaLevel){ valleyCount++; }
            touchedSeaLevel = false;
        }
        System.out.println(valleyCount);
    }
}