#include <cmath> #include <cstdio> #include <vector> #include <iostream> #include <algorithm> using namespace std; int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */ int n; char ch[1000009]; scanf("%d",&n); cin>>ch; int ans=0; int cur=0; int flag=0; for(int i=0;i<n;i++){ if(ch[i]=='U'){ cur++; } else{ cur--; } if(cur<0){ flag=1; } if(flag==1 && cur==0){ flag=0; ans++; } } cout<<ans<<endl; return 0; }