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 keyboard = new Scanner(System.in);
        int numSteps = keyboard.nextInt();
        int stepsFromSea = 0;
        int valleys = 0;
        int hills = 0;
        String steps = keyboard.next();
        for (int i = 0; i < numSteps; i++){
            char stepDir = steps.charAt(i);
            if(stepDir == 'U'){
                stepsFromSea++;
                if(stepsFromSea == 0){
                    valleys++;
                }
            } else {
                stepsFromSea--;
                if(stepsFromSea == 0){
                    hills++;
                }
            }
        }
        System.out.println(valleys);
    }
}