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#include <stdio.h>
#include <stdlib.h>

int lines;
int bottles;

int main()
{
	scanf("%d %d", &lines, &bottles);
	
	int best_year = 2020;
	
	for (int y = 0; y < lines; y++) {
		for (int x = 0; x < y + 1; x++) {
			int year;
			scanf("%d", &year);
			
			int moves = (x + 1) * abs(y - x + 1);
			
			if (moves <= bottles) {
				if (year < best_year) {
					best_year = year;
				}
			}
		}
	}
	
	printf("%d\n", best_year);
}