//Author: Koppu
#include <stdio.h>
#include <stdlib.h>
int calc_stats(char *a, int n) {
	int i;
	int cur_pos = 0;
	int mnt_cnt = 0;
	int val_cnt = 0;
	for(i = 0; i < n; i++) {
		if(a[i] == 'U') {
			cur_pos++;
			if(cur_pos == 0)
				val_cnt++;
		}
		else if(a[i] == 'D') {
			cur_pos--;
			if(cur_pos == 0)
				mnt_cnt++;
		}
		else
			continue;
	}
	return val_cnt;
}

int main(void) {
	int n;
	scanf("%d", &n);
	char a[n];
	scanf("%s", a);
	printf("%d",calc_stats(a, n));
	return 0;
}