#include<bits/stdc++.h>
using namespace std;
int a[100005]={0},n,x,ans;
void f(int l,int r){
	int mid=(l+r)>>1;
	if(a[mid]==x) ans=mid;
	else if(a[mid]<=x) f(1,mid);
	else f(mid+1,r);
} 
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
	}
	cin>>x;
	f(1,n);
	cout<<ans;
}
/**************************************************************
	Problem: 1236
	User: panyuchen
	Language: C++
	Result: Runtime Error
****************************************************************/