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#include<bits/stdc++.h>

using namespace std;

int main(){
    int n, k;
    cin >> n >> k;
    int ans = 2020;
    for(int y = 1; y <= n; y++){
        for(int x = 1; x <= y; x++){
            int p, q;
            cin >> p;
            q = x * (y - x + 1) - 1;
            if(q <= k && p < ans)ans = p;
        }
    }
    cout << ans;
}