#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; }