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#include <iostream>
#include <algorithm>

using namespace std;

int main(){
    ios_base::sync_with_stdio(0);
    int n, k;
    cin>>n>>k;

    int x=0, y=0, current_min=numeric_limits<int>::max()-1;

    while(x<n){
        x ++; y = 1; int xi = x;
        while(xi>=1){
            int b;
            cin>>b;
            int bx = (xi*y);
            if(bx<=k)
                current_min = min(b, current_min);
            xi--;
            y ++;
        }
    }

    cout<<current_min<<endl;
}