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 s = sc.next();
        int count =0;
        int slope =0;
      char[] steps = new char[n];
      for(int i=0; i<n; i++){
          steps[i]=s.charAt(i);
          if(steps[i]=='U'){
              slope++;
              if(slope==0){
                  count++;
              }
          }else{
              slope--;
          }
      }
        System.out.println(count);
    }
}