import std.algorithm, std.container, std.conv, std.math, std.range, std.typecons, std.stdio, std.string;

auto rdsp(){return readln.splitter;}
void pick(R,T)(ref R r,ref T t){t=r.front.to!T;r.popFront;}
void readV(T...)(ref T t){auto r=rdsp;foreach(ref v;t)pick(r,v);}
void readS(T)(size_t n,ref T t){t=new T(n);foreach(ref v;t){auto r=rdsp;foreach(ref j;v.tupleof)pick(r,j);}}

void main()
{
  int n, k; readV(n, k);
  struct D { int a, b; }
  D[] d; readS(n, d);

  auto c = 0L;
  foreach (di; d) {
    c += di.b;
    if (c >= k) {
      writeln(di.a);
      return;
    }
  }
}
