import java.util.*;
public class Main
{
    public static void main(String[]args)
    {
        Scanner sc=new Scanner(System.in);
        int a=sc.nextInt();
        String c=sc.nextLine();
        char b[]=c.toCharrArray();
        int sea_level=0;
        int valley=0;
        for(int i=0;i<b.length;i++)
        {
            if(b[i]=='U')
            {
                sea_level++;
            }
            else
            {
                valley++;
            }
        }
        System.out.print(valley);
    }
}

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