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();
        char[] steps = in.next().toCharArray();
        int level = 0;
        int h = 0;
        for( char step : steps){
            if( step == 'U'){
                level++;
                if( level == 0 ){
                    h++;
                    level = 0;
                }
            } else {
                level--;
            }
        }
        System.out.println(h);
    }
}