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#include <iostream>
#include <math.h>
#include <cctype>
 
using namespace std;
 
unsigned long long conversions[1000000000] = {0};
 
unsigned long long12
 convert_to_currency(unsigned long long coins)
{
	if(floor(coins/2) + floor(coins/3) + floor(coins/4) > coins)
	{
		if(conversions[coins])
		{
			return conversions[coins];
		}
		conversions[coins] = convert_to_currency(floor(coins/2)) + convert_to_currency(floor(coins/3))  + convert_to_currency(floor(coins/4));
		return conversions[coins];
	}
 
	return coins;
}
 
int main() {
	unsigned long long coins = 0;
 
	while(cin>>coins)
	{
		cout<<convert_to_currency(coins)<<endl;
	}
 
	return 0;
}

prog.cpp:7:42: error: size of array ‘conversions’ is too large
 unsigned long long conversions[1000000000] = {0};
                                          ^
prog.cpp:10:2: error: expected initializer before ‘convert_to_currency’
  convert_to_currency(unsigned long long coins)
  ^

Standard output is empty