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) {
        Scanner in=new Scanner(System.in);
        int i,m=0,s=0,a=0,f=0;
        int n=in.nextInt();
        String str=in.next();
        char[] c = str.toCharArray();
        for(i=0;i<n;i++)
            {
              
            if(c[i]=='U')
                m=1;
            if(c[i]=='D')
                m=-1;
            s=s+m; 
            if(s<0)
                a=1;
            if(s>0)
                a=2;
            if(s==0&&a==1)
                f++;
        }
        System.out.println(f);
    }
}