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#include <stdio.h>

int main(){

	int n,k;
	
	scanf("%d", &n);
	scanf("%d", &k);
	int min_year = 3000;
		
	for (int i = 0; i < n; i++){
		for(int j = 0; j<=i; j++){
			int barrel;
			scanf("%d", &barrel);
			if(((j+1)*(i-j+1)<=k)&&(barrel<min_year)){
				min_year = barrel;
			}
		}
	}
	
	printf("%d",min_year);
}