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

public class Solution {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int N = scanner.nextInt();
        char []step=new char[N];
        String steps=scanner.next();
        step=steps.toCharArray();
        int height=0;
        int previous=0;
        int count=0;
        for (int i=0;i<N;i++){
            if (step[i]=='U'){
                height++;
            }else {
                height--;
            }
            if(height==-1 && previous==0){
                count ++;
            }
            previous=height;
        }
        System.out.println(count);
    }
}