#include <iostream>
#include <fstream>
using namespace std;

ifstream f;
ofstream m;
long G,W,i,a[6];
int main()
{
    f.open("energii.in");
    m.open("energii.out");

    f>>G;
    f>>W;
    if((1<G)&&(G<1001)&&(1<W)&&(W<5001))
    {
for(i=1;i<=6;i++)
{
    f>>a[i];
}
for(i=1;i<=6;i++)
{
    if((a[i]==W)&&(1<a[i])&&(a[i]<10001)&&(1<a[i+1])&&(a[i+1]<10001))
    {
        m<<a[i+1];
    }
}
    }

    return 0;
}