#include <iostream>
#include <vector>

int main() {
    std::vector<int> arr = {1, 3, 3, 7, 9, 9, 9, 9, 11, 11, 12, 14};
    int maxLen = 1, currentLen = 1;

    for (size_t i = 1; i < arr.size(); i++) {
        if (arr[i] == arr[i - 1]) {
            currentLen++;
        } else {
            currentLen = 1;
        }
        maxLen = std::max(maxLen, currentLen);
    }

    std::cout << maxLen << std::endl;
    return 0;
}