n=list(input())
count=0
for i in range(len(n)):
    if n[i]=="8":
        count+=2
    elif n[i]=="0":
        count+=1
    elif n[i]=="4":
        count+=1
    elif n[i]=="6":
        count+=1
    elif n[i]=="9":
        count+=1
    else:
        count+=0
ans=2*len(n)+count+1
anv=2*(count+1)+len(n)
print(min(ans,anv))