import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

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 stepcount = in.nextInt();
        in.nextLine();
        String steps = in.nextLine();
        boolean newSeaLevel = false;
        int countSeaLevel = 0;
        steps = steps.toUpperCase();
        int countVally = 0;
        int finalVally = 0;
        for(int i = 0; i < stepcount; i++)
        {
        	if(countSeaLevel == 0){
        		if(steps.charAt(i) == 'D'){
        			newSeaLevel = true;
        		}
                
                if(newSeaLevel){
        			countVally++;
        			newSeaLevel = false;
        		}
        		
        	}
        	
        	if(steps.charAt(i) == 'D')
        		countSeaLevel -= 1;
    		else
        		countSeaLevel += 1;
        }
        System.out.println(countVally);
    }
}