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#include<cstdio>
#include<vector>

using namespace std;

int calcBottlesToTakeOff(int row, int col) {
    int closerCol = (col <= row/2) ? col : (row - col);
    return (closerCol + 1) * (row - closerCol + 1);
}

int main() {

    int height;
    int neededBottlesNum;
    scanf("%d %d\n", &height, &neededBottlesNum);

    vector<vector<int> > wineYears;
    for (int i = 0; i < height; i++) {
        wineYears.push_back(vector<int>());
        for (int j = 0; j < i + 1; j++) {
            int nextYear;
            scanf("%d", &nextYear);
            wineYears[i].push_back(nextYear);
        }
    }

    int minYear = wineYears[0][0];
    for (int i = 1; i < height; i++) {
        for (int j = 0; j < i + 1; j++) {
            int nextYear = wineYears[i][j];
            if (nextYear < minYear && calcBottlesToTakeOff(i, j) <= neededBottlesNum) {
                minYear = nextYear;
            }
        }
    }

    printf("%d\n", minYear);

    return 0;
}