#include<iostream>

#include<string>

#include<stdio.h>

#include<algorithm>

#include<cstring>

#include<cstdio>

#include <math.h>

using namespace std;

char a[];

long b;

long s;

int main(){

    scanf("%s",a);

    scanf("%d",&b);

    int len = strlen(a);

    s = ;

    for(int i = ;i<len;i++)

    {

        s += (a[i]-) * pow(,len - i - );

    }

    //cout<<s<<endl;

    cout<<s*b<<endl;

    //printf("%s\n",a);

    return ;

}