static void Main()
{
var n = ReadInt();
var k = ReadLong();
var dict = new SortedMultiSet <int>();
n.Times(() => new { a = ReadInt(), b = ReadInt() }).ForEach(x => dict[x.a] += x.b);
foreach (var key in dict.Keys)
{
k -= dict[key];
if (k <= 0)
{
key.WriteLine();
return;
}
}
}
static void Main()
{
var n = ReadInt();
var k = ReadLong();
var dict = new SortedMultiSet <int>();
for (int i = 0; i < n; i++)
{
var a = ReadInt();
var b = ReadInt();
dict[a] += b;
}
foreach (var key in dict.Keys)
{
k -= dict[key];
if (k <= 0)
{
key.WriteLine();
return;
}
}
}
public SortedMultiSet(SortedMultiSet <T> source) : this(source.occurrence)
{
}