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#include <iostream>
#include <cmath>

using namespace std;

int main(){

    int n,k, najstarsze=2019,temp;
    cin >>n >>k;
    
    for (int i = 1;i <=n;i++) {

	for(int j=1;j<=i;j++){
	
	cin >> temp;
	
	if( i*j -j*j + j<=k) {
	    if (temp<najstarsze) najstarsze =temp;
	    }
	
	}

				
    

    }
    cout <<najstarsze<<endl;

}