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

public class Solution {

    public static void main(String[] args) {
       Scanner scanner = new Scanner(System.in);
        int numSteps = scanner.nextInt();
        scanner.nextLine();
        String stepsStr = scanner.nextLine();
        int[] steps = new int[numSteps];
        int i = 0;
        for(char c : stepsStr.toCharArray()){
            if(c == 'U' || c == 'u'){
                steps[i++] = 1;
            }else if(c == 'D' || c == 'd'){
                steps[i++] = -1;
            }
        }
        
        boolean isNegative = false;
        int valleyCount = 0;
        int sum = 0;
        for(i = 0; i < steps.length; ++i){
            
            sum +=steps[i];
            
            if(sum < 0){
                isNegative = true;
            }
            
            if(sum == 0 && isNegative){
                ++valleyCount;
                isNegative = false;
            }
        }
        
        System.out.println(valleyCount);
    }
}