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 input = new Scanner(System.in);
        int n = input.nextInt();
        String stepPattern = input.next();
        int[] altitude = new int[n+1];
        int currentAlt = 0;
        altitude[0] = currentAlt;
        for (int i = 0; i < n; i++){
            if (stepPattern.charAt(i) == 'U'){
                currentAlt++;
            }
            else{
                currentAlt--;
            }
            altitude[i+1] = currentAlt;
        }
        int valley = 0;
        for (int k = 1; k < altitude.length; k++){
            if (altitude[k] == 0 && altitude[k-1] < 0){
                valley++;
            }
        }
        System.out.println(valley);
    }
}