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 scanner = new Scanner(System.in);
        int count = scanner.nextInt();
        String line = scanner.next();
        scanner.close();
        
        int numOfValley = 0;
        int numOfM = 0;
        int sum = 0;
        
        for(int i=0; i<count; i++){
            char character = line.charAt(i);
            if(character == 'U'){
                sum++;
                if(sum == 0){
                    numOfValley++;
                }
            }else if(character == 'D'){
                sum--;
                if(sum == 0){
                    numOfM++;
                }
            }
            
        }
        
        System.out.println(numOfValley);
    }
}