#include <cmath>
#include <cstdio>
#include <vector>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <cstring>

using namespace std;

const int MaxN = 1000000+64;
int h[MaxN];
char s[MaxN];

int main() {
	/* Enter your code here. Read input from STDIN. Print output to STDOUT */
	int n,len,cnt;
	cin >> n >> s+1;
	len = strlen(s+1),cnt = h[0] = 0;
	for(int i = 1;i <= n;i++){
		if(s[i] == 'U')	h[i] = h[i-1] +1;
		else if(s[i] == 'D')	h[i] = h[i-1]-1;
		if(s[i] == 'D' && h[i-1] == 0)	cnt ++;
	}
	cout << cnt << endl;
	return 0;
}