#include <iostream>

using namespace std;

int main() {
	
	int n, kolko = 0, visina = 0, flag = 0;
	string s;
	
	cin >> n >> s;
	
	for( int i=0; i<s.size(); i++ ) {
		
		if( s[i] == 'U' ) {
			visina++;
			if( visina == 0 && flag == 1 ) {
				kolko++;
				flag = 0;
			}
        }
		else { 
			if( visina == 0 )
				flag = 1;
			
			visina--;
		}
	}
		
	cout << kolko;
	
	
	return 0;
}