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 in = new Scanner(System.in);
            int steps = in.nextInt();
            int counter = 0;
            int valleys =0;
            int prev  = 0;
            String stepSeries = in.next();
            for(int i=0; i<steps; i++){
                    char step = stepSeries.charAt(i);
                    if(step == 'U'){
                             
                            ++counter;
                    }else if(step == 'D'){
                            --counter;
                    }
                    if(counter == -1 && prev == 0){
                            ++valleys;
                    }
                    prev=counter;
                   // System.out.println(counter);
            }
            System.out.println(valleys);
    }
}