num = int(input())

i, j, flag = 0,0,False
for i in range(76):
    for j in range(42):
        if 4*i + 7*j == num:
            flag = True
           
            break
    if flag == True:
        break
          
                 
if flag == False:
    print("-1")
else:
    print("4"*i, end="")
    print("7"*j, end="")