#include<iostream>
using namespace std;
int st,x,n,dr,poz,m,a[101];
int main()
{   cout<<"n= "; cin>>n;
    cout<<"x= "; cin>>x;
    for(int i=1;i<=n;i++) cin>>a[i];
    st=1; dr=n; poz= -1;
    while(poz== -1 && st<=dr)
    {
        m=(st+dr)/2;
        if(a[m]==x) poz=m;
        else if(x<a[m]) dr=m-1;
        else st=m+1;
    }
    if(poz>=0) cout<<poz;
    else cout<<x;
    return 0;
}