import sys

def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))

from array import array

n = II()
kk, ll, dd = array("Q"),array("Q"),array("I")
mx = 0
for _ in range(n):
    k, l, d = LI()
    kk.append(k)
    ll.append(l)
    dd.append(d)
    mx = max(mx, l+(k-1)*2**d)

def binary_search(l, r, ok, minimize):
    if minimize: l -= 1
    else: r += 1
    while l+1 < r:
        m = (l+r)//2
        if ok(m) ^ minimize: l = m
        else: r = m
    if minimize: return r
    return l

def ok(m):
    cnt = 0
    for k, l, d in zip(kk, ll, dd):
        cnt += max(0, (m-l)//(1 << d)+1)
    return cnt & 1 == 0

ans = binary_search(-1, mx, ok, False)
print(ans+1)