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

public class Solution {

  public static void main(String[] args) {
		
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		char[] steps = new char[n];
		String stepString = scanner.next();
		steps = stepString.toCharArray();
		int step1 = 0,step2 = 0, v = 0 ;
		for(int i = 0; i < steps.length; i++){
			if(steps[i] == 'D'){
				step2 = step2-1;
			}
			if(steps[i] == 'U'){
				step2 = step2 + 1;
			}
			
			if(step1 == 0 && step2 < 0){
				v++;
			}
			
			step1 = step2;
		}
		
		System.out.println(v);

	}

}