sum=0
dictionary=['0','4','6','8']
prime_count=0
max=11
def prime(x):
if x<2: return False
if x==2 : return True
if x%2==0: return False
a=3
while a**2 <= x:
if x%a==0: return False
a=a+2
return True
if __name__=="__main__":
count=10
while prime_count < max:
count+=1
countM=str(count)
if any([i in dictionary for i in list(countM) ])==False:
judge=1
for i in range(len(countM)):
if prime(int(countM[i:len(countM)]))==False:
judge=0
break
if prime(int(countM[:i+1]))==False:
judge=0
break
if judge==1:
prime_count+=1
sum+=count
print sum