import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        String up_down = in.next();
        
        int curPos = 0;
        int valleyCount = 0;
        boolean inValley = false;
        for(int i = 0; i<N; i++){
            if(curPos<0 && !inValley){
              //System.out.println("In valley.");
              inValley=true;
            }
            if(curPos==0 && inValley){
                valleyCount+=1;
                inValley=false;
                //System.out.println("Out valley.");
            }
            if(up_down.charAt(i)=='U'){
                //System.out.println("U at pos: " + curPos);
                curPos+=1;
            }
            if(up_down.charAt(i)=='D'){
                //System.out.println("D at pos: " + curPos);
                curPos-=1;
            }
        }
        if(curPos==0 && inValley){
                valleyCount+=1;
                inValley=false;
               // System.out.println("Out valley.");
            }
        System.out.println(valleyCount);
    }
}