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 track = in.nextLine();
        track = in.nextLine();
        
        boolean valley = false;
        int height = 0;
        int valleyCnt = 0;
        
        for(int i=0; i<n; i++){
        	char step = track.charAt(i);
        	if(step=='U') {
        		if(height==0) valley = false;
        		height++;
        	}
        	else {
        		if(height==0) valley = true;
        		height--;
        	}
        	if(height==0 && valley) valleyCnt++;
        }
        
       
        System.out.println(valleyCnt);
    }
}