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

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 in = new Scanner(System.in);
    	long n = in.nextInt();
    	int height = 0;
    	int mountainCount = 0;
    	int valleyCount = 0;
    	int temp = 0;
    	
    	String direction = in.next();

    	for(int i=0; i<n; i++){
    		if(direction.charAt(i) == 'U'){
    			temp = height;
    			height++;
    		} else { 
    			if(direction.charAt(i) == 'D') {
    				temp = height;
    				height--;
    			}
    		}
    		//System.out.println(height);
    		if(height<0 && (temp)==0){
    			valleyCount++;
    			}
    	} System.out.println(valleyCount);
    }
}