import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        
        if(isValidValue(n)) {
            String steps = in.next();
            
            System.out.println(getNumberOfValleys(steps));
        }
    }
    
    private static int getNumberOfValleys(String steps) {
        if(isValidValue(steps.length())) {
            int seaLevel = 0;
            int valleys = 0;
            boolean isValleyIn = false;
            boolean isValleyOut = false;
            
            for(int i = 0; i < steps.length(); i++) {
                char step = steps.charAt(i);
                
                if(step == 'U') {
                    seaLevel++;
                } else if(step == 'D') {
                    seaLevel--;
                }
                
                if(seaLevel < 0) {
                    isValleyIn = true;
                    isValleyOut = false;
                } else if(seaLevel >= 0 && isValleyIn) {
                    isValleyIn = false;
                    isValleyOut = true;
                } else if(seaLevel >= 0 && !isValleyIn) {
                    isValleyIn = false;
                    isValleyOut = false;
                }
                
                if(isValleyOut) {
                    valleys++;
                }
            }
            
            return valleys;
        } else {
            return 0;
        }
    }

    private static boolean isValidValue(int i) {
        return i >= 2 && 1 <= 1000000;
    }
}