import std.algorithm, std.array, std.container, std.range, std.bitmanip;
import std.numeric, std.math, std.bigint, std.random, core.bitop;
import std.string, std.regex, std.conv, std.stdio, std.typecons;

void main()
{
  auto n = readln.chomp.to!size_t;
  auto li = iota(n).map!(_ => readln.split.map!(to!long)).array;

  long calc(long x) {
    auto s = li.map!(l => l[0] + l[1] * x);
    return s.reduce!(max) - s.reduce!(min);
  }

  auto r0 = calc(1);
  auto r1 = calc(2);
  if (r0 < r1) {
    writeln(1);
    return;
  }

  auto mi = 1L, ma = 2L;
  while (r0 > calc(ma)) ma <<= 1;
  while (ma - mi > 2) {
    auto mt1 = (mi * 2 + ma) / 3;
    auto mt2 = (mi + ma * 2) / 3;
    auto rt1 = calc(mt1);
    auto rt2 = calc(mt2);
    if (rt1 > rt2)
      mi = mt1;
    else
      ma = mt2;
  }

  auto r = long.max, m = 0L;
  foreach (mc; mi..ma+1) {
    auto rc = calc(mc);
    if (rc < r) {
      r = rc;
      m = mc;
    }
  }

  writeln(m);
}