dosya = open("newfile.txt")
satirlar = dosya.readlines()
X = []
C = []
index = 0
def asalsayibulma(a):
  sayac=0
  sayi=a
  for i in range(2,int(sayi)):
    if(int(sayi)%i==0):
      sayac+=1
      break
  if(sayac!=0):
    return True
  else:
    return False

for i in range(0,len(satirlar)):
  C = []
  B = satirlar[i].replace("\n","").split(" ")
  if i == 0:
      X.append(int(B[i]))
      index = 0
  else:
    if index == 0:
      for k in range(index,index+2):
        num = int(B[k])
        
        not_prime = asalsayibulma(num)
        if not_prime:
          C.append(num) 
          
    else:
      for p in range(index-1,index+2):
        num = int(B[p])
        not_prime = asalsayibulma(num)
        
        if not_prime:
          C.append(num)
          
    D = max(C)
    X.append(D)
    index = B.index(str(D))
    
    
print(sum(X))