#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int n;
  cin >> n;
  int ret = 0, mx = 0;
  for (int i = 1; i <= n; i++) {
    int a;
    cin >> a;
    if (mx < i) {
      ret++, mx = a;
    } else
      mx = max(mx, a);
  }
  cout << ret << endl;
}
