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 scan = new Scanner(System.in);
        int N = scan.nextInt();
        String input = scan.next();
        char[] steps = new char[N];
        for(int i = 0; i < N; i++) {
            steps[i] = input.charAt(i);
        }
        
        int level = 0;
        boolean goingUp = false;
        int valleyCount = 0;
        for(char step : steps) {
            if(step == 'U') {
                goingUp = true;
                level++;
            } else {
                goingUp = false;
                level--;
            }
            if(level == 0 && goingUp) {
                valleyCount++;
            }
        }
            
        System.out.printf("%d", valleyCount);
    }
}