text: #include <iostream>
  #include <string>
  using namespace std;
  
  int main() {
  	//为方便使用不同类型存储数据，变量名声明为 phoneNumber
  	//采用long long类型
  	//long long phoneNumber;
  
  	//采用字符数组char[]
  	//char phoneNumber[12];
  	
  	//采用string类型
  	//string phoneNumber;
  
  	//采用unsigned long long类型
  	//unsigned long long phoneNumber;
  
  	//采用double类型
  	double phoneNumber;
  	//long double phoneNumber;
  
  	//采用long float类型
  	//long float phoneNumber;
  
  	cout.precision(0);
  	cin >> phoneNumber;
  	cout << fixed << phoneNumber;
  
  	return 0;
  }
  