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#define _CRT_SECURE_NO_WARNINGS 1
#define _WINSOCK_DEPRECATED_NO_WARNINGS 1

#include <cstdio>
#include <algorithm> 

using namespace std;

int main()
{
    int n, k;
    scanf("%d%d", &n, &k);

    int answer = 6666;

    for (long long i = 1; i <= n; ++i)
    {
        for (long long j = 1; j <= i; ++j)
        {
            int year;
            scanf("%d", &year);
            long long s = (i - j + 1 ) * j;
            if (s <= k)
            {
                answer = min(answer, year);
            }
        }
    }


    printf("%d", answer);
}