#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
int n;
const int maxn = 1000000 + 5;
struct Data {
	int height;
	int step;
};
Data arr[maxn];
int main() {
	while (scanf("%d\n", &n) != EOF) {
		int level = 0;
		for (int i = 0; i < n; ++i) {
			char ch;
			scanf("%c", &ch);
			if (ch == 'U') {
				arr[i].step = 0;
				level += 1;
			}
			else if (ch == 'D') {
				arr[i].step = 1;
				level -= 1;
			}
			arr[i].height = level;
		}
		int cnt = 0;
		int cur = 0;
		bool head = 0;
		for (int i = 0; i < n; ++i) {
			if (arr[i].step == 1 && arr[i].height == -1) {
				head = 1;
			}
			else if (arr[i].step == 0 && arr[i].height == 0) {
				++cnt;
				head = 0;
			}
		}
		printf("%d\n", cnt);
	}
	return 0;
}