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 moveNum;
        Scanner in = new Scanner(System.in);
        moveNum = in.nextInt();
        String moves = in.next();
        int[] levels = new int[moveNum];
	int last = 0;
        for(int i = 0; i < moveNum; i++)
        {
            if(moves.charAt(i) == 'U')
            {
                last++;
                levels[i] = last;
            }
            else
            {
                last--;
                levels[i] = last;
            }
        }
        int vallies = 0;
        boolean startValley = false;
        for(int i = 0; i < levels.length; i++)
        {
            if(levels[i] < 0)
            {
                startValley = true;
            }
            else if((levels[i] >= 0) && startValley)
            {
                vallies++;
                startValley = false;
            }
        }
        System.out.println(vallies);
    }
}