import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
                
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String steps = in.nextLine();
        steps = in.nextLine();
        
        int numValley = 0;
        int alti = 0;
        int prevAlti = 0;
        
        for(int i = 0; i < n; i++){
            prevAlti = alti;
            if(steps.charAt(i)=='D'){
                alti--;
            }
            else{
                alti++;
            }
            
            if(alti<0 && prevAlti == 0){
                numValley++;
            }
            
        }
        
        System.out.println(numValley);
    }
}