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#include<bits/stdc++.h>
using namespace std;

const int M = ((int)(1e9)) + 50;
int a,temp,k,wyn = M; 
int calculateTurn(int x, int y){
	return x * (y - x + 1);
}

int main(){
	ios_base::sync_with_stdio( 0 );
	cin.tie( 0 );
	cin>>a>>k;
	for (int i = 1; i <= a; i++){
		for (int j = 1; j <= i; j++){
			cin>>temp;
			if(calculateTurn(j , i) <= k) {
				wyn = min(wyn , temp);
			}
		}
	}
	cout<<wyn<<endl;	
}