#include <bits/stdc++.h>
using namespace std;
const int dx[]={0,1,0,-1,1,-1,-1,1};
const int dy[]={-1,0,1,0,1,1,-1,-1};
const int INF = 1<<30;
const double EPS = 1e-15;
#define PB push_back
#define mk make_pair
#define fi first
#define se second
#define ll long long
#define reps(i,j,k) for(int i = (j); i < (k); i++)
#define rep(i,j) reps(i,0,j)
#define MOD 1000000007
typedef pair<int,int> Pii;
typedef pair<int,Pii> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
int main(){
	int N;
	while(scanf("%d",&N),N){
		int array[128];
		rep(i,N){
			scanf("%d",&array[i]);
		}
		int M;
		scanf("%d",&M);
		int l = 0;
		int r = N;
		int cnt = 1;
		while(l+1 != r){
			int med = (l+r)/2;
			if(array[med] == M)break;
			if(array[med] > M)r = med;
			else l = med;
			cnt++;
		}
		printf("%d\n",cnt);
	}
    return 0;
}