#include <bits/stdc++.h> using namespace std; int main() { int n,updown = 0,res = 0; char c; cin >> n; for(int i = 0; i++ < n;){ cin >> c; if(c == 'U')updown++; else updown--; if(updown == 0 && c == 'U')res++; } cout << res << endl; return 0; }