#include <bits/stdc++.h> using namespace std; int a[105],b[105],g[105]; int main(){ int n,i,j,t,maxl=0; cin>>n; for(i=1;i<=n;++i) cin>>a[i]>>b[i]>>g[i]; for(i=1;i<=3;i++){ int maxt=0,c[5]={0,1,2,3,0}; for(j=1;j<=n;++j){ int t=c[a[j]]; c[a[j]]=c[b[j]]; c[b[j]]=t; if(c[g[j]]==i) maxt++; } maxl=max(maxl,maxt); } cout<<maxl; return 0; }