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#include <cstdio>

int main(){
	int i=1,j=1,diag=1;
	int n,k,ni,min,el;
	scanf("%d",&n);
	scanf("%d",&k);
	min = 2020;
	for(ni=0;ni<(n*(n+1))/2;ni++){
		scanf("%d",&el);
	//	printf("%d, %d\n",i*j,min);
		if(i*j<=k){
			if(el<min)
				min=el;
		}
		if(i==1){
			i = j+1;
			j = 1;
		}
		else{
			i--;
			j++;
		}
	}
	printf("%d",min);
}