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 s = new Scanner(System.in);
        int n = s.nextInt();
        String steps = s.next();
        int level = 0;
        int valley=0;
        int hill = 0;
        for(int i=0;i<n;i++){
            if(steps.charAt(i) == 'U'){
                if(level==0) hill++;
                level++;
            }else if(steps.charAt(i) == 'D'){
                if(level==0) valley++;
                level--;
            }          
        }
        System.out.println(valley);
    }
}