Anagrammatic Primes

#include<bits/stdc++.h>

using namespace std;

int anaPrime[] = {2,3,5,7,11,13,17,31,37,71,73,79,97,113,131,199,311,337,373,733,919,991};

int main()
{
    long long n,i,num;

    while(scanf("%lld",&n)&&n)
    {
        num = 1;

        while(num<=n)
        {
            num*=10;
        }

        bool dhukse = false;

        for(i=0;i<22;i++)
        {
            if(anaPrime[i]>n && anaPrime[i]<num)
            {
                dhukse = true;

                printf("%d\n",anaPrime[i]);

                break;
            }
        }

        if(!dhukse)
        {
            puts("0");
        }
    }

    return 0;
}