#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>

int main(){
    int n,j=0; 
    scanf("%d",&n);
    int *calories = malloc(sizeof(int) * n);
    for(int calories_i = 0; calories_i < n; calories_i++){
       scanf("%d",&calories[calories_i]);
    }
    // your code goes here
    long int sum=0;
  
    for(int calories_i = 0; calories_i < n; calories_i++)
        {
        sum=sum+(calories_i*pow(2,j));
        j++;
    }
    printf("%li",sum+1);
    return 0;
}