#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;
}