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#include <bits/stdc++.h>
using namespace std;
const int N = 1010;
int n;
int a[N], f[N];
int res;
int main() {
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1; i <= n; i++) {
f[i] = 1; // 一个以i结尾的序列，最少可以是i自己，长度是1
for (int j = 1; j < i; j++)
if (a[i] > a[j]) // i可以接在j后面
f[i] = max(f[i], f[j] + 1); // 借力于j
res = max(res, f[i]);
}
printf("%d", res);
return 0;
