#include <vector>
#include <iostream>

using namespace std;


int main() {
	int n;
	int elevation = 0;
	int valley = 0;
	int mountain = 0;

	cin >> n;
	vector<char> step(n);

	for ( int i = 0; i < n; i ++)
	{
	cin >> step[i];

	if (step[i] == 'U' || step[i] == 'u')
	{
	elevation += 1;
	}

	if (step[i] == 'D' || step[i] == 'd')
	{
	elevation -= 1;
	}

	if (elevation == 0 )
	{
	if (step[i] =='D' || step[i] == 'd') 
	mountain += 1;
	else
	valley += 1;
	}

	}
	cout << valley;

    return 0;
}