#include<stdio.h>



int main()
{
    long long int n,i,j,k;
    scanf("%lld",&n);
    long long int arr[n+5],mx=0,cnt=0;

    for(i=0;i<n;i++)
    {
        scanf("%lld",&arr[i]);
        if(arr[i]==mx)
            cnt++;
        if(arr[i]>mx)
        {
            mx=arr[i];
            cnt=1;
        }
    }
    if(cnt>1)
        printf("The world is doomed! :(\n");
    else
        printf("%lld\n",mx);
    return 0;
}