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#include <iostream>
#include<cstdio>
#include<algorithm>
using namespace std;

#define MAX 2003
#define REP(x, n) for(int x = 0;x < n; x++)
#define FOR(x, b, e) for(int x = b, x <= e; x++)


int main(){

	int n, k, a;
        int min_year=2019;
	scanf("%d%d", &n, &k);
	REP(x, n){
		REP(y, x+1){
			scanf("%d", &a);
			if((y+1)*(x-y+1)<=k && a < min_year)
				min_year = a;
//			cout<<x<<" "<<y<<" "<<(y+1)<<" "<<x-y+1<<" "<<min_year<<endl;
		}
	}
	printf("%d\n", min_year);
	return 0;
}