#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[20]={0},n=0,b=0,x,d=0;
	cin>>n;
	for(b=0;b<n;b++){
		cin>>a[b];
	}
	cin>>x;
	for(b=0;b<n;b++){
		if(a[b]==x){
			d=b+1;
			break;
		}
	}
	cout<<d;
	
}
/**************************************************************
	Problem: 1154
	User: lvrenxiang
	Language: C++
	Result: Wrong Answer
****************************************************************/