#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int arr[n], c;
  for (int i = 0; i < n; i++) cin >> arr[i];
  c = arr[0];
  int ans = 0;
  for (int i = 1; i <= n; i++) {
    if (i == c) ans++;
    if (arr[i] > c) c = arr[i];
  }
  cout << ans;
  return 0;
}
