#!/usr/bin/env python3

def primes(n):
    sieve = [True] * n
    for p in range(2, int(n**0.5)):
        if not sieve[p]:
            continue
        for i in range(p**2, n, p):
            sieve[i] = False
    return [i for i, p in enumerate(sieve) if p][2:]

target = 40
repw = 10**9
lim = 10**6
nums = primes(lim)
c = 0
s = 0

for p in nums[3:]:
    if p%4 != 1 and p%5 != 1:
        continue
    if pow(10, repw, 9*p) == 1:
        c += 1
        s += p
        #print c, p
        if c == target:
            break

if c < target:
    print("Limit reached. Count = {}/{}".format(c, target))

print(s)