#!/usr/bin/ python3.8
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
import numpy as np

N = int(readline())
KLD = np.array(read().split(), np.int64)

K = KLD[::3]
L = KLD[1::3]
D = KLD[2::3]
D2 = 1 << D


def test(x):
    # x 以下が奇数個ある
    return np.minimum(K, np.maximum(0, (x - L) // D2 + 1)).sum() % 2 == 1


left = -1
right = 10 ** 18 + 10
while left + 1 < right:
    x = (left + right) // 2
    if test(x):
        right = x
    else:
        left = x
print(right)