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 totalSteps = in.nextInt();
        String steps = in.next();
        //System.out.println(steps);
        int vallyCount = 0;
        int seaLevel = 0;
        for(int i=0; i < steps.length(); i++){
            char c = steps.charAt(i);
            //System.out.println(c);
            if(c == 'U') {
                seaLevel++;
                if(seaLevel == 0) {
                    //System.out.println(seaLevel);
                    vallyCount++;
                }
            } else {
                seaLevel--;
            }
        }
        System.out.println(vallyCount);
    }
}