#include <iostream>
#include <unordered_map>

using namespace std;

int main() {
    int m, n;
    cin >> m >> n;
    const int total = m * n;
    int x;
    unordered_map<int, int> h;
    for (int i = 0; i < total; ++i) {
        cin >> x;
        if (++h[x] * 2 > total) {
            cout << x << endl;
            break;
        }
    }

    return 0;
}