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#include <stdio.h>

using namespace std;

int main()
{
    int n;
    long int k, val;
    int oldest = 2019;
    scanf ("%d",&n);
    scanf ("%d",&k);
    for(int i = 1; i <= n; i++){
        for(int j = 0; j < i; j++){
            int temp = (i - j) * (j + 1);
            scanf ("%d",&val);
            if(temp <= k && val < oldest)
                oldest = val;
        }
    }
    printf("%d", oldest);
    return 0;
}