main()
{
int a[14],c[6]={1,2,4,8,16,32},i,n,s=0;
char b[20];
scanf("%s",b);while(a[i++]!='\0')
n++;
for(i=0;i<(n-1)/2;i++)
{a[i]=b[2*i];}
for(i=0;i<(n-1)/2;i++)
{s=s+c[a[i]-1];}
printf("%d\n",s);
}