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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
	int numSteps{};
	int prevLoc{};
	int curLoc{};
	int numValley{};
	char direction{};

	cin >> numSteps;

	for (int i = 0; i < numSteps; ++i)
	{
		cin >> direction;
		if (direction == 'U')
		{
			prevLoc = curLoc;
			curLoc++;
		}
		else if (direction == 'D')
		{
			prevLoc = curLoc;
			curLoc--;
		}

		if (prevLoc == 0)
		{
			if (curLoc < 0)
			{
				numValley++;
			}
		}
	}
	cout << numValley;
    return 0;
}