#include <bits/stdc++.h>
using namespace std;
void helper(int n,vector<int>a,int& tar,int idx){
	if(n==0  ){
	 //cout<<"not found"<<endl;
 
	 return;
 
	}
 
	//cout<<"down  "<<a[n-1]<<endl;
 
	helper(n-1,a,tar,idx);
		if(a[n-1] == tar){
		idx = n-1;
		return;
 
	}
	//cout<<"up  "<<a[n-1]<<endl;
}
int main() {
	int n,tar;cin>>n>>tar;
	vector<int>a(n);
	for(int i = 0;i<n ;i++){
		cin>>a[i];
	}
 int idx =0;
	helper(n,a,tar,idx);
	cout<<"idx  "<<idx<<endl;
	// your code goes here
	return 0;
}

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