#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    long t;
	cin >> t;
	long cnt = 0;
	long cnt_d = 0;
	while (t--) {
		char inp;
		cin >> inp;
		if (cnt == 0 && inp == 'D') ++cnt_d;
		if (inp == 'U') ++cnt;
		else if (inp == 'D') --cnt;
	}

	cout << cnt_d << endl;
    
    return 0;
}