import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int x = 0;
        String s = new String(in.next());
        int valley = 0;
        
        for(int i =0;i<s.length();i++){
            if((s.charAt(i) == 'D')&&(x==0)){
                valley++;
                x--;
            }else if((s.charAt(i)=='D')){
                x--;
            }else if(s.charAt(i)=='U')
                x++;
                
        }
        System.out.print(valley);
    }
}