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) {
        int valleys = 0;
        int seaLevel = 0;
        boolean startValley = false;
        Scanner in = new Scanner(System.in);
        int num = in.nextInt();
        String movement = in.next();
        char [] move = movement.toCharArray();
        for(int i = 0; i < num;i++){
            if(move[i] == 'U'){
                seaLevel++;
            }
            if(move[i] == 'D'){
                seaLevel--;
            }
            if(seaLevel == 0 && startValley == true){
                valleys++;
                startValley = false;
            }
            if(seaLevel < 0){
                startValley = true;
            }            
        }
        System.out.println(valleys);
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
    }
}