a=int(input())
if a==0:
    print(10)
    exit()
if a==1:
    print(1)
    exit()
def tajzie(n):
    t=[]
    i=9
    while n!=1:
        while n%i==0:
            n=n//i
            t=t+[i]
        if (i==2 and n!=1):
            return(t+[n])
        i=i-1
    return(t)
try:
    l=tajzie(a)
    if max(l)>9:
        1/0
    l=l[::-1]
    for i in l:
        print(i,end="")
except:
    print(-1)