import std.algorithm, std.conv, std.range, std.stdio, std.string;

void main()
{
  auto n = readln.chomp.to!size_t;
  auto vti = n.iota.map!(_ => readln.split.to!(int[])).map!(rd => VT(rd[0], rd[1])).array;
  vti.sort!"a.v + a.t < b.v + b.t";

  auto maxV = vti.back.v + vti.back.t;

  auto dp = new bool[](maxV + 1);
  dp[0] = true;

  foreach (i; n.iota) {
    auto dp2 = chain(repeat(false).take(vti[i].v), dp.dup.take(vti[i].t), repeat(false));
    foreach (ref d1, d2; lockstep(dp, dp2))
      d1 = d1 | d2;
  }

  writeln(dp.enumerate.filter!"a.value".array.back.index);
}

struct VT { int v, t; }