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 scan = new Scanner(System.in);
        int n = scan.nextInt();
        String s = scan.next();
        char[] data = s.toCharArray();
        int runCount = 0;
        int noOfVal = 0;
        boolean isBelowSea = false;
        for (char step : data) {
            if (step == 'U') {
                runCount++;
            } else {
                runCount--;
            }
            if(runCount < 0) {
                isBelowSea = true;
            } else if(runCount == 0 && isBelowSea) {
                noOfVal++;
                isBelowSea=false;
            }
        }
        
        System.out.println(noOfVal);
    }
}