#include <cmath> #include <cstdio> #include <vector> #include <iostream> #include <algorithm> using namespace std; int main() { int n,counter=0,a=0,prev=0; cin>>n; char c[n]; cin>>c; for(int j=0;j<n;j++){ if(c[j]=='U'){ prev=a; a++; } else{ prev=a; a--; } if(prev<0 && a==0){ counter++; continue; } } cout<<counter<<endl; return 0; }