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#include<cstdio>
int main(){
    int n,k,i,j,d,mn=2020;
    scanf("%d%d",&n,&k);
    for(i=2;i<n+2;++i)
        for(j=1;j<i;++j){
            scanf("%d",&d);
            if(j*(i-j)<=k && mn>d)
                mn=d;
        }
    printf("%d\n",mn);
}