#define USE_MATH_DEFINES 1
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define MOD 998244353ll
#define INF 1000000000000000000ll
#define EPS 1e-9
#define getchar_unlocked _getchar_nolock
#define putchar_unlocked _putchar_nolock
typedef long long ll;
typedef long double ld;
typedef pair <ll,ll> pl;
typedef tuple <ll,ll,ll> tl;
ll N, acnt, maxh, chgt, cpos;
set <ll> H[1000005];
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> N;
for (ll i = 1; i <= N; i++) {
ll x;
cin >> x;
H[x].insert(i);
}
acnt = 0;
maxh = 1000000;
while (maxh > 0) {
if (H[maxh].empty()) {
maxh--;
continue;
}
acnt++;
chgt = maxh;
cpos = 0;
while (true) {
auto it = H[chgt].upper_bound(cpos);
if (it == H[chgt].end()) break;
cpos = *it;
H[chgt].erase(it);
chgt--;
}
}
cout << acnt;
return 0;
}
