title: How To Print Maximum Number Of A Using Given Four Keys
signature: long long howToPrintMaximumNumberOfAUsingGivenFourKeys(int n) {
test_code: #include <algorithm>
  #include <assert.h>
  #include <cstdlib>
  #include <iostream>
  #include <map>
  #include <set>
  #include <string>
  #include <tuple> 
  #include <unordered_map>
  #include <vector>
  #include <math.h>
  #include <cmath>
  #include <bits/stdc++.h>
  #include <numeric>
  #include <functional>
  
  using namespace std;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(long long actual, long long expected){
      return actual == expected;
  }
  
  string driver(int n, long long expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(n), expected)){
              return "PASSED";
          }
          return "FAILED";
      }
      catch (const std::overflow_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::runtime_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::exception& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (...)
      {
          return "UNK_ERROR";
      }
  }
  
  int main() {
      string result = "";
  
      result = driver(41, 110592); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver(94, 274877906944); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver(80, 5435817984); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver(40, 82944); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver(76, 1811939328); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver(5, 5); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver(43, 196608); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver(67, 150994944); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver(24, 1024); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver(90, 86973087744); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
source_py: def how_to_print_maximum_number_of_a_using_given_four_keys(N):
      if (N <= 6):
          return N
      screen = ([0] * N)
      for n in range(1, 7):
          screen[(n - 1)] = n
      for n in range(7, (N + 1)):
          screen[(n - 1)] = max((2 * screen[(n - 4)]), max((3 * screen[(n - 5)]), (4 * screen[(n - 6)])))
      return screen[(N - 1)]
source_cpp: int how_to_print_maximum_number_of_a_using_given_four_keys(int N) {
    if ( N <= 6 ) return N;
    int screen [ N ];
    int b;
    int n;
    for ( n = 1;
    n <= 6;
    n ++ ) screen [ n - 1 ] = n;
    for ( n = 7;
    n <= N;
    n ++ ) {
      screen [ n - 1 ] = max ( 2 * screen [ n - 4 ], max ( 3 * screen [ n - 5 ], 4 * screen [ n - 6 ] ) );
    }
    return screen [ N - 1 ];
  }