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 scan = new Scanner(System.in);
        int N = scan.nextInt();
        int numOfValleys = 0;
        int level = 0;
        int lastLevel = level;
        String steps = scan.next();
        
        for(int i = 0; i < N; i++){
            lastLevel = level;
            
            char step = steps.charAt(i);
            if(step == 'U'){
               level++; 
            }
            else if(step == 'D'){
               level--; 
            }
            
            if(lastLevel == 0 &&
               level == -1){
                numOfValleys++;
            }
        }
        
        /* Ended below sea level; Remove 1 valley from count */
        if(level < 0){
            numOfValleys--;
        }
        
        System.out.println(numOfValleys);
    }
}