primes = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 
          31, 37, 41, 43, 47, 53, 59, 61, 67, 71,
          73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 
          127, 131, 137, 139, 149, 151, 157, 163, 167, 173,
          179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 
          233, 239, 241, 251, 257, 263, 269, 271, 277, 281,
          283, 293, 307, 311, 313, 317]
 
def isPrime(x) :
    global primes
 
    for p in primes :
       if x%p==0 :
           return False
    return True
 
v = 777
 
for a in range(0,10):
    for b in range(0,10):
        for x in [v*100+a*10+b, a*10000+v*10+b, a*10000+b*1000+v] :
            if isPrime(x) :
                 print x

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