#include <iostream>
using namespace std;

int main() {
	int n;
	cin >> n;

	bool inMountain = true;
	int altitude = 0, numValleys = 0;

	char x;
	for (int i = 0; i < n; i++) {
		cin >> x;

		altitude += x == 'U' ? 1 : -1;
		if (!altitude) {
			cerr << "finished valley/mountain: " << (!inMountain ? 1 : 0)
				 << endl;
			numValleys += inMountain ? 0 : 1;
		} else if (altitude == -1 || altitude == 1)
			inMountain = altitude == 1;
	}
	cout << numValleys << endl;
}