import core.bitop;
import std.algorithm;
import std.ascii;
import std.bigint;
import std.conv;
import std.functional;
import std.math;
import std.numeric;
import std.range;
import std.stdio;
import std.string;
import std.random;
import std.typecons;
import std.container;

alias sread = () => readln.chomp();
ulong bignum = 1_000_000_007;
alias Pair = Tuple!(long, "number", long, "times");

T lread(T = long)()
{
    return readln.chomp.to!T();
}

T[] aryread(T = long)()
{
    return readln.split.to!(T[])();
}

void scan(TList...)(ref TList Args)
{
    auto line = readln.split();
    foreach (i, T; TList)
    {
        T val = line[i].to!(T);
        Args[i] = val;
    }
}

void main()
{
    long n, k;
    scan(n, k);
    auto inputary = new Pair[](n);
    foreach (ref e; inputary)
    {
        long a, b;
        scan(a, b);
        e = Pair(a, b);
    }
    inputary.sort!"a.number < b.number"();
    long limit;
    foreach (e; inputary)
    {
        if(limit + e.times >= k)
        {
            e.number.writeln();
            break;
        }
        
        limit += e.times;
    }
}