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 N = in.nextInt();
        String str = in.next();
        char[] strArr = str.toCharArray();
        boolean v_s = false;
        boolean v_c = false;
        int v = 0;
        int s_l = 0;
        for(int i=0;i<strArr.length;i++) {
            if(strArr[i] == 'U') {
                s_l++;
            } else {
                s_l--;
            }
            if(s_l < 0){
                v_s = true;
            }
            if(v_s && s_l == 0) {
                v_c = true;
            }
            
            if(v_c) {
                v++;
                v_c = false;
                v_s = false;
                s_l = 0;
            }
        }
        System.out.println(v);
    }
}