import java.util.*;
class Test{
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
		String st=sc.next();
		int valleys=0;
		int sea_level=0;
		for(int i=0;i<n;i++){
			char  cc=st.charAt(i);
			if(cc=='U'){
				sea_level++;
                if(sea_level==0)
                    valleys++;
            }    
			else 
				sea_level--;
        }    
		System.out.println(valleys);
	}
}