#include "iostream" using namespace std; int p[4]={0,1,2,3}; int r[10]; int main(){ int a,b,g; int n; cin>>n; for(int i=1;i<=n;i++){ cin>>a>>b>>g; swap(p[a],p[b]); r[p[g]]++; } cout<<max(r[1],max(r[2],r[3])); return 0; }