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 sc = new Scanner(System.in);
        int n = sc.nextInt();
        String str = sc.next();
        int alt = 0;
        int valcount = 0;
        int hillovall = 0;
        char[] car = str.toCharArray();
        for(int i = 0; i < n; i++){
         if(car[i] == 'U'){
             alt++;
         } else {
             alt--;
         }
         if(alt > 0){
             hillovall = 1;
         } else if(alt < 0) {
             hillovall = -1;
         }
         if(alt == 0 && hillovall == -1){
             valcount++;
         }
        }
        System.out.println(valcount++);
    }
}