#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct TArr
{
    __int64 MyArray[7];
};

__int64 FindNumber(int i)
{
    __int64 Number = i, Prev = 0, Step = 1;
    int Digit = i;
    do
    {
        Step = Step * 10;
        Number = Number + Step * ((Digit * 2) % 10 + Prev);
        Prev = (Digit * 2) / 10;
        Digit = Number / Step;
    } while ((Digit != i) || (Prev != 0));
    Number = Number - Digit * Step;
    return Number;
}

struct TArr GetArray()
{
    __int64 MyArr[7];
    int i;
    printf_s("This program searches for the smallest number, which, when you rearrange the last digit to the first one, is twice as large as the original\n");
    printf_s("This is the list of required numbers :\n ");
    for (i = 0; i < 7; i++)
    {
        MyArr[i] = FindNumber(i + 2);
        printf_s("%d : %I64d\n", i + 2, MyArr[i]);
    }
    struct TArr MyArray = { MyArr[0],  MyArr[1],  MyArr[2],  MyArr[3],  MyArr[4],  MyArr[5],  MyArr[6] };
    return MyArray;
}

void ShowAnswer(TArr MyArray)
{
    __int64 Min = MyArray.MyArray[6];
    for (int i = 0; i < 7; i++)
        if (MyArray.MyArray[i] < Min)
            Min = MyArray.MyArray[i];
    printf_s("Minimum required number is : %I64d", Min);
}

int main()
{
    TArr NumArr = GetArray();
    ShowAnswer(NumArr);
    int lol = 0;
    scanf_s("%d", &lol);
    return 0;
}