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

public class Solution {

    private static int getStepVal(char c){
		return ('U' == c)?1:-1;
	}
	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 scan = new Scanner(System.in);
        int steps = scan.nextInt();
        String stepDetail = scan.next();
        int numberVallies = 0;
        int sumOfSteps = 0;
        for(int i=0;i<steps;i++){
        	sumOfSteps += getStepVal(stepDetail.charAt(i));
        	numberVallies = (sumOfSteps == -1 && (-1 == getStepVal(stepDetail.charAt(i))))?numberVallies+1:numberVallies;
        }
        System.out.print(numberVallies);
        
    }
}