// full.cpp

#include <iostream>


int main() {
  int base;
  std::cout << "Base: ";
  if (!(std::cin >> base) || base > 9 || base < 2) {
  	std::cerr << "Integer base in range [2, 9] required\n";
    return 1;
  }
  char input;
  long double result = 0;
  long double current_power = 1.0l / (long double)base;
  std::cout << "Number: ";
  if (!std::cin >> input) {
  	std::cerr << "Incorrect input\n";
    return 2;
  }
  if (!(input >= int('0') && input <= int('9')) && !(input == '-' || input == '+')) {
    std::cerr << "Unknown character: " << input << '\n';
    return 3;
  }
  if (input > base - 1) {
  	std::cerr << input << " is invalid number in base number system with base " << base << '\n';
    return 4;
  }
  bool sign = true;
  switch (input) {
    case '-':
      sign = false;
      break;
    case '+'
      break;
    default:
      result += input - int('0');
  }
  bool fraction = false;
  while (std::cin >> input) {
    if (!(input >= int('0') && input <= int('9')) && !(input == '.')) {
      std::cerr << "Unknown character: " << input << '\n';
      return 3;
    }
    if (input == '.' && fraction) {
    	std::cerr << "Unexpected symbol '.'\n;
      return 5;
    }
    if (input > base - 1) {
  	  std::cerr << input << " is invalid number in base number system with base " << base << '\n';
   	  return 4;
  	}
    if (input == '.') {
      fraction = true;
      continue;
    }
    if (fraction) {
      result += (input - int('0')) * current_power;
      current_power /= base;
    } else {
      result *= base;
      result += input - int('0');
    }
  }
  if (!sign) {
  	std::cout << '-';
  }
  std::cout << result << '\n';
}