#include <bits/stdc++.h>
using namespace std;
#define loop(i,b,e) for(int i=b;i<=e;i++)
#define reloop(i,e,b) for(int i=e;i>=b;i--)

int n,ans,x,y,m=0,mpred;
string s;

int main() {
   cin >> n >> s;
   int b;
   loop(i,0,s.length()-1) {
      if (s[i] == 'R')
         x++;
      else
         y++;
      if (x-y == 1 && b != 1) {
         ans++;
         b = 1;
      }
      if (y-x == 1 && b != 2) {
         ans++;
         b = 2;
      }
   }
   cout << ans-1;
}