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 scan = new Scanner(System.in);
        int nbStep = scan.nextInt();
        String steps = scan.next();
        int levelTemp = 0;
        int seaLevel = 0;
        int nbValley = 0;
        boolean inValley = false;
        for(int i=0; i<steps.length(); i++){
            if(steps.charAt(i) == 'U'){
                levelTemp++;
            } else {
                levelTemp--;
            }
            if(levelTemp < seaLevel && !inValley){
                inValley = true;
            }
            if(levelTemp >= seaLevel && inValley){
                nbValley++;
                inValley = false;
            }
        }
        System.out.println(nbValley);
    }
}