#include <vector>
#include <iostream>
#include <string>

using namespace std;

int main(){
	int n = 0, level = 0, answer = 0;
	bool valley = false;
	char temp;
	cin >> n;
	char s [n];
	cin >> s;
	for (int i = 0; i < n; ++i){
		temp = s[i];
		//cout << s[i] << " " << temp << endl;
		if (level != 0){
			//cout << "Level not 0: (" << level << ")" << endl;  
			if (temp == 'U'){
				//cout << "Going " << temp << endl;
				if (valley && level == -1){
					//cout << "Valley true and level == -1" << endl;
					valley = false;
					++answer;
					//cout << "Valley now false, answer = " << answer << endl;
				}
				++level;
				//cout << "Level increased (" << level << ")" << endl;
            }
			else{
				//cout << "going " << temp << endl;
				--level;
				//cout << "Level decreased (" << level << ")" << endl;
			}
		}

		else{
			//cout << "Level = 0" << endl;
			if (temp == 'D'){
				//cout << "Going " << temp << endl;
				valley = true;
				--level;
				//cout << "Valley now true, level decreasing to " << level << endl;
			}
			else{
				//cout << "Going " << temp << endl;
				++level;
				//cout << "increasing level (" << level << ")" << endl;
			}
		}
		//cout << "Current Level: " << level << endl;
	}
    cout << answer;
}