#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


#define MOUNTAINS 1
#define VALLEY -1
#define NO_CHANGE 0
int checkMountainOrValley(int height, char previous)
{
	if(height == 0 && previous == 'U')
		return VALLEY;
	else if(height == 0 && previous == 'D')
		return MOUNTAINS;
	else
		return NO_CHANGE;
}

int main() {
	/* Enter your code here. Read input from STDIN. Print output to STDOUT */
	int height = 0;
	int n = 0;
	cin >> n;

	string str;
	cin >> str;

	int cnt_mount = 0;
	int cnt_valley = 0;
	int status = 0;
	for (int i = 0; i < str.size(); i++)
	{
		if(str[i] == 'U')
		{
			height++;
		}
		else if(str[i] == 'D')
		{
			height--;
		}
		status = checkMountainOrValley(height, str[i]);
		if(status == MOUNTAINS)
			cnt_mount++;
		else if(status == VALLEY)
			cnt_valley++;
		else 
			;
	}

	cout << cnt_valley;

	return 0;
}