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) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scn = new Scanner(System.in);
        int inSize = scn.nextInt();
        String userInput = scn.next();
        char[] charIn = userInput.toCharArray();
        int up =0;
        int down =0;
        int numOfValleys = 0;
        
        for(int i=0 ;i< inSize ; i++){
            if(charIn[i]== 'U'){
                up++; 
                 if(up!=0 && down !=0 && up-down==0 ){
                numOfValleys++;
            }
            }else{
                down++;
            }
        }     
        System.out.println(numOfValleys);
    }
}