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#include <iostream>

#include <vector>

using namespace std;

int main() {
    
    int n, k;
    while(scanf("%d%d", &n, &k) == 2) {

        int response = 2020;
        for(int i = 0; i < n; i++) {
            
            for(int j = 0; j <= i; j++) {
                int a;
                scanf("%d", &a);
                int z = (j + 1) * (i - j + 1);            
                            
                if(z <= k) {
                    response = std::min(a, response);
                } 
                
            }
        }
        
        printf("%d\n", response);
    }
    return 0;
}