import java.util.*;
class hill
{
    public static void main(String args[])
    {
        Scanner ex=new Scanner(System.in);
        int n=ex.nextInt();
        String s=ex.next();
        int count1=0,num=0;
        for(int i=0;i<n;i++)
        {
            char c=s.charAt(i);
            if((num==0)&&(c=='D'))
            {
                count1++;
            }
            if(c=='D')
            num--;
            else
            num++;
        }
        System.out.println(count1);
    }
}