#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int a[n];
  for (int i = 0; i < n; i++) cin >> a[i];
  int days = 1, current = a[0];
  for (int i = 1; i < n; i++) {
    if ((i + 1) <= current) {
      current = max(a[i], current);
      continue;
    } else {
      days++;
      current = max(a[i], current);
    }
  }
  cout << days << endl;
  return 0;
}
