保密员(baomi)

#include<iostream>
#include<string>
#include<stdio.h>
#include<algorithm>
#include<cstring>
#include<cstdio>
#include <math.h>

using namespace std;
int a;
char b[];
float s;
int main(){
    scanf("%d %s",&a,b);
    //printf("%s\n",b);
    int len = strlen(b);
    s= ;
    for(int i =  ; i < len ; i++)
    {
        int t = ;
        if(b[i] >= 'A')
            t = b[i] -'A' + ;
        else
            t = b[i] - '';

        s += pow(a,-i+) * t;
    }
    s *= ;
    s = floor(s + 0.5);
    s /= ;
    printf("%0.4f\n",s);
    //printf("%s\n",a);
    return ;
}