#include <iostream>
using namespace std;
int main() {
    int k;
    cin >> k;
    int nums[k];
    for (int i = 0; i < k; i++) cin >> nums[i];
    int dp[k];
    int ans = 1;
    for (int i = 0; i < k; i++) {
        dp[i] = 1;
        for (int j = 0; j < i; j++) {
            if (nums[j] >= nums[i] && dp[j] + 1 > dp[i]) dp[i] = dp[j] + 1;
        }
        if (dp[i] > ans) ans = dp[i];
    }
    cout << ans << endl;
    return 0;
}