#include<iostream> #include<string> #include<stdio.h> #include<algorithm> #include<cstring> #include<cstdio> #include <math.h>  using namespace std; int a; char b[100]; float s; int main(){     scanf("%d %s",&a,b);     //printf("%s\n",b);     int len = strlen(b);     s= 0;     for(int i = 2 ; i < len ; i++)     {         int t = 0;         if(b[i] >= 'A')             t = b[i] -'A' + 10;         else             t = b[i] - '0';                      s += pow(a,-i+1) * t;     }     s *= 10000;     s = floor(s + 0.5);     s /= 10000;     printf("%0.4f\n",s);     //printf("%s\n",a);     return 0; }