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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String inclines = in.next();
        int current_elevation = 0;
        int num_valleys = 0;
        for(int steps_i=0; steps_i < n; steps_i++){
            char incline = inclines.charAt(steps_i);
            if (incline == 'U') {
                current_elevation++;
            } else {
                current_elevation--;
                if (current_elevation == -1) {
                    num_valleys++;
                }
            }
        }
        System.out.println(num_valleys);
    }
}