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 input = new Scanner(System.in);
		int steps = input.nextInt();
		input.nextLine();
		String upAndDown = input.nextLine();
		input.close();
		int[] path = new int[steps];
		int level = 0;
		int count = 0;
		for (int i=0;i < steps;i++){
			//System.out.println(upAndDown.charAt(i));
			if (upAndDown.charAt(i)=='D'){
				path[i] = -1;
			}
			if (upAndDown.charAt(i)=='U'){
				path[i] = 1;
			}
			level = level + path[i];
			if (level==0 && path[i]==1){
				count++;
			}
		}
		
		System.out.print(count);
    }
}