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

public class Solution {

    public static void main(String[] args) throws IOException {
        /* 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();
        int[] steps = new int[n];
        char[] c = in.next().toCharArray();
        int elevation = 0;
        int numValleys = 0;
        boolean isInValley = false;
        for(int i = 0; i < n; i++) {
            if(c[i] == 'U') steps[i] = 1;
            else steps[i] = -1;
        }
        
        for(int j = 0; j < n; j++) {
            elevation += steps[j];
            if(elevation < 0 && !(isInValley)) {
                numValleys++;
                isInValley = true;
            }
            if(elevation >= 0) isInValley = false;
        }
        System.out.println(numValleys);
    }
}