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 in = new Scanner(System.in);
        
        int numSteps = in.nextInt();
        String steps = in.next();
        
        int numVall = 0;
        int counter = 0;
        
        //Sea level 0, step down -1, step up +1
        for(int x = 0; x < numSteps; x++) {
            int prev = counter;
            if(steps.charAt(x) == 'U') {
                counter++;
            } else if (steps.charAt(x) == 'D') {
                counter--;
            }
            
            if(prev < 0 && counter == 0) {
                numVall++;
            }
        }
        
        System.out.println(numVall);
    }
}