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

void main()
{
  auto n = readln.chomp.to!int - 1;
  auto m = readln.chomp.to!int;
  auto pqi = iota(m).map!(i => readln.split.map!(to!int).map!(x => x - 1));

  auto ci = [false, false, false];
  ci[n] = true;

  foreach (pq; pqi) {
    swap(ci[pq[0]], ci[pq[1]]);
  }
  
  writeln(ci.countUntil(true) + 1);
}