/* nuttela - Soham Chakrabarti */

#include <bits/stdc++.h>

using namespace std;

#define IO ios_base::sync_with_stdio(false);cin.tie(NULL);
#define endl '\n'

typedef long long ll;
typedef long double ld;
typedef pair <int, int> pii;

const int N = 1e3;
const int inf = -1;
const int MOD = 1e9 + 7;

int main() {
  int n, k; cin >> n >> k;
  int a[n];

  for (int i = 0; i < n; ++i)
  {
    cin >> a[i];
  }

  bool ok = false;
  for (int i = n - 1; i >= 0; --i)
  {
    if (a[i] == k) {
      cout << (i + 1);
      ok = true;
      break;
    }
  }
  if (!ok) cout << 0;
  return 0;
}