/**
 * 
 * 
 * 
 * 
 * 
 */

#include <iostream>

using namespace std;

int main()
{
	int n;	// number of steps
	int e;	// track elevation
	char tmp;	// tmp var to hold "D" or "U"; will be translated to 0 or 1
	
	// counting variables
	int mountains = 0;	// number of mountains
	int valleys = 0;	// number of valleys
	int c;			// counter of steps

	do
	{
		cin >> n;
	}
	while (n < 2 || n > 1000000);
	
	char steps[n];	// array to track steps as up or down
	
	for (int i = 0; i < n; i++)
	{
		// do
		// {
			cin >> steps[i];
		// }
		// while (tmp != 'U' || tmp != 'D');
	}
	

	
	// track the hike
	e = 0;
	c = 0;
	int stepsM = 0;
	int stepsV = 0;
	
	for (int i = 0; i < n+1; i++)
	{
		// move up or down
		if (steps[i] == 'U')
			e += 1;
		else if (steps[i] == 'D')
			e -= 1;
		
		
		if (e <= -1)
		{
			stepsV = stepsV + 1;
		}
		
		
		// add 1 to valleys if back at sea level
		if (e == 0 && stepsV >= 1)
		{
			valleys = valleys + 1;
			stepsV = 0;
		}
		

	}
	
	
	cout << valleys << endl;
	
	// for (int i = 0; i < n; i++)
	// {
	// 	if (e == 0)
	// 		cout << "_";
	// 	if (steps[i] == 'U')
	// 		cout << "/";
	// 	if (steps[i] == 'D')
	// 		cout << "\\";
		
	// 	// move up or down
	// 	if (steps[i] == 'U')
	// 		e += 1;
	// 	else if (steps[i] == 'D')
	// 		e -= 1;
	// }
	// cout << endl;
	
	return 0;
}