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#include <iostream>
#include <vector>

int main()
{
    int n, k;
    std::cin>>n>>k;
    int year[n*n];
    for(int i = 0; i < n*n; ++i)
        year[i] = 2020;
    std::vector<int> diffs;
    diffs.push_back(1);
    std::cin>>year[1];
    if(n == 1)
    {
        std::cout<<year[1]<<"\n";
        return 0;
    }
    std::cin>>year[2];
    int val;
    std::cin>>val;
    if(val < year[2])
        year[2] = val;
    for(int r = 3; r <= n; ++r)
    {
        if(r % 2 == 1)
            diffs.push_back(1);
        int v[r + 1];
        for(int i = 0; i < r+1; ++i)
            v[i] = 0;
        for(int c = 1; c <= (r / 2) + (r % 2); ++c)
        {
            if(c == 1)
                v[c] = r;
            else
            {
                v[c] = v[c - 1] + diffs[c - 1];
                ++ diffs[c - 1];
            }
            std::cin>>val;
            if((year[v[c]] == 2020) || (year[v[c]] > val))
                year[v[c]] = val;
        }
        int a = (r / 2) + (r % 2);
        int b = a;
        if(r % 2 == 0)
            ++b;
        for(int c = 1; c <= r / 2; ++c)
        {
            v[a + c] = v[b - c];
            std::cin>>val;
            if((year[v[a + c]] == 2020) || (year[v[a + c]] > val))
                year[v[a + c]] = val;
        }
    }
    int res = 2020;
    for(int i = 1; i <= k; ++i)
    {
        if(year[i] < res)
            res = year[i];
    }
    std::cout<<res<<"\n";
}