#include <cstdio>
#include <iostream>
#include <vector>
typedef long long ll;
#define REP(i,a,b) for(ll (i)=a;(i)<(ll)(b);++(i))
#define rep(i,n) REP(i,0,n)
using namespace std;

int main(){
	//std::ios::sync_with_stdio(false);std::cin.tie(0);
	int N;
	scanf("%d",&N);
	vector<ll> K(N), L(N);
	vector<int> D(N);
	rep(i, N) scanf("%lld%lld%d",&K[i],&L[i],&D[i]);
	ll lb = -1, ub = (ll)1e18+10;
	while(ub-lb>1){
		ll md = (lb+ub+1)/2;
		int x = 0;
		rep(i, N){
			ll t = md-L[i];
			if(t<0) continue;
			t >>= D[i];
			t = min(t, K[i]-1);
			if(t%2==0) x = !x;
		}
		(x==1?ub:lb)=md;
	}
	cout<<ub<<endl;
	return 0;
}