#include <bits/stdc++.h>   using namespace std;   int n, a[110], suml[110], sumr[110], ans = 0;   int main() {     cin >> n;     for (int i = 1; i <= n; i++) cin >> a[i];     for (int i = 1; i <= n; i++) suml[i] = suml[i - 1] + (a[i] == 0);     for (int i = n; i >= 1; i--) sumr[i] = sumr[i + 1] + (a[i] == 1);     for (int i = 1; i <= n; i++) ans = max(ans, suml[i] + sumr[i]);     cout << ans;     return 0;   }   