Решение задачи Число E с Acmp

#include <bits/stdc++.h>
 
using namespace std;
 
int main()
{
    int n;
    cin >> n;
    switch(n){
    case 0:  cout << "3"; break;
    case 1:  cout << "2.7"; break;
    case 2:  cout << "2.72"; break;
    case 3:  cout << "2.718"; break;
    case 4:  cout << "2.7183"; break;
    case 5:  cout << "2.71828"; break;
    case 6:  cout << "2.718282"; break;
    case 7:  cout << "2.7182818"; break;
    case 8:  cout << "2.71828183"; break;
    case 9:  cout << "2.718281828"; break;
    case 10: cout << "2.7182818285"; break;
    case 11: cout << "2.71828182846"; break;
    case 12: cout << "2.718281828459"; break;
    case 13: cout << "2.7182818284590"; break;
    case 14: cout << "2.71828182845905"; break;
    case 15: cout << "2.718281828459045"; break;
    case 16: cout << "2.7182818284590452"; break;
    case 17: cout << "2.71828182845904524"; break;
    case 18: cout << "2.718281828459045235"; break;
    case 19: cout << "2.7182818284590452354"; break;
    case 20: cout << "2.71828182845904523536"; break;
    case 21: cout << "2.718281828459045235360"; break;
    case 22: cout << "2.7182818284590452353603"; break;
    case 23: cout << "2.71828182845904523536029"; break;
    case 24: cout << "2.718281828459045235360288"; break;
    case 25: cout << "2.7182818284590452353602875"; break;
    }
    return 0;
}