a=input()
sum=0
sum+=1*(a.count("1"))
sum+=2*(a.count("2"))
sum+=3*(a.count("3"))
sum+=4*(a.count("4"))
sum+=5*(a.count("5"))
sum+=6*(a.count("6"))
sum+=7*(a.count("7"))
sum+=8*(a.count("8"))
sum+=9*(a.count("9"))
print(sum)