#include<stdio.h>
#include<math.h>
int sum=0,i,n,s[1000],p,j;
long long t=0,a;
int main()
{
for(i=0;i<=300;i++)
{
n = scanf("%d", &s[i]);
sum = sum + n;
}
for(j=0;j<=sum;j++)
{
//printf ("j=%d\n",j);
a=pow(2,(sum-1));
p=s[j]*a;
t=t+p;
}
printf("%lld",t);
return 0;
}