#include <iostream>
#include <algorithm>
#include <vector>

using namespace std;

int main(int argc, char const *argv[]) {
	
	ios::sync_with_stdio(0);

	int n;
	vector<char> steps;
	char step;
	int valley;
	int prev, cur;

	cin >> n;

	for (int i = 0; i < n; ++i) {
		cin >> step;
		steps.push_back(step);
	}

	valley = 0;
	prev = cur = 0;

	for (int i = 0; i < n; ++i) {
		if (steps[i] == 'U') {
			cur++;
		}
		else  { 					//if (steps[i] == 'D')
			cur--;
		}

		if (prev == 0) {
			if (cur < 0) {
				valley++;
			}
		}

		prev = cur;
	}

	cout << valley << '\n';

	return 0;
}